.balance method returning non-zero, while mapping (address => uint256) returning non-zero - ethereum

Question

I am trying to create a token on the BSC without reflections, with a simple flat fee for a dev wallet, and another fee for liquidity.
I am getting an error on every call to the following function:
function _transferStandard(address sender, address recipient, uint256 tAmount) private {
require(balanceOf(sender) > tAmount, "Insuficient balance for transaction.");
(uint256 tTransferAmount, uint256 fee) = _getValues(tAmount);
_tOwned[sender] = _tOwned[sender].sub(tAmount);
_tOwned[devWallet] = _tOwned[devWallet].add(fee);
_tOwned[recipient] = _tOwned[recipient].add(tTransferAmount);
emit Transfer(sender, recipient, tTransferAmount);
}
Subtraction is overflowing whenever tokens are removed from the senders wallet. Upon further analysis I discovered that the following function:
function balanceOf(address _owner) public view returns (uint256 balance){
return _owner.balance;
}
Will return a correct value of 1721391030000000000 for the owner balance (max supply is transfered to owner after deployment of the contract). However, the following function, which one would expect the same output from, is returning 0, as in the wallet has no balance.
function balanceOf_tOwned(address _owner) public view returns (uint256 balance){
return _tOwned[_owner];
}
_tOwned, on the other hand, is a simple mapping variable.
mapping (address => uint256) private _tOwned;
I am confused as to why balances appear as 0 when _tOwned is used.
Edit: I have now tested the dead wallet address 0x0000000000000000000000000000000000000000 for both functions. The results are diferent for both:
balanceOf returns: 10491075026009005720565 balanceOf_tOwned returns:
115792089237316195423570985008687907853269984665640000000000000000000000000000
I am again puzzled as to what this means, but possibly it is the mapping is actually returning the conversion to my token from BNB? I.e. its value of 380,000 USD in BNB (https://bscscan.com/address/0x0000000000000000000000000000000000000000).
Full contract code:
// SPDX-License-Identifier: Unlicensed
pragma solidity ^0.8.12;
abstract contract Context {
function _msgSender() internal view virtual returns (address payable) {
return payable(msg.sender);
}
function _msgData() internal view virtual returns (bytes memory) {
this;
return msg.data;
}
}
interface IERC20 {
function totalSupply() external view returns (uint256);
function transfer(address recipient, uint256 amount) external returns (bool);
function allowance(address owner, address spender) external view returns (uint256);
function approve(address spender, uint256 amount) external returns (bool);
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
}
library SafeMath {
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
}
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return div(a, b, "SafeMath: division by zero");
}
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
uint256 c = a / b;
return c;
}
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return mod(a, b, "SafeMath: modulo by zero");
}
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
library Address {
function isContract(address account) internal view returns (bool) {
bytes32 codehash;
bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
assembly { codehash := extcodehash(account) }
return (codehash != accountHash && codehash != 0x0);
}
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
(bool success, ) = recipient.call{ value: amount }("");
require(success, "Address: unable to send value, recipient may have reverted");
}
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
return _functionCallWithValue(target, data, 0, errorMessage);
}
function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
return _functionCallWithValue(target, data, value, errorMessage);
}
function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
require(isContract(target), "Address: call to non-contract");
(bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
if (success) {
return returndata;
} else {
if (returndata.length > 0) {
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// The actual contract
contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
constructor () {
address msgSender = _msgSender();
_owner = msgSender;
renounceOwnership();
}
function owner() public view returns (address payable) {
return payable(_owner);
}
modifier onlyOwner() {
require(_owner == _msgSender(), "Ownable: caller is not the owner");
_;
}
function renounceOwnership() public virtual onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
}
}
contract COOLCONTRACT is Context, IERC20, Ownable {
using SafeMath for uint256;
using Address for address;
mapping (address => uint256) private _tOwned;
mapping (address => mapping (address => uint256)) private _allowances;
uint256 private constant MAX = ~uint256(0);
uint256 _tTotal = 10 * 10**8 * 10**18;
uint256 private _rTotal = (MAX - (MAX % _tTotal));
string private _name = 'igb';
string private _symbol = 'yiibg';
uint8 private _decimals = 9;
constructor () {
_tOwned[owner()] = _rTotal;
}
// 80% donated, 20% used to fund the project
address payable private devWallet = payable(0x40C31d8F17338841FA1c8Af2F619B21428B1f358);
function name() public view returns (string memory) {
return _name;
}
function symbol() public view returns (string memory) {
return _symbol;
}
function decimals() public view returns (uint8) {
return _decimals;
}
function totalSupply() public view override returns (uint256) {
return _tTotal;
}
function balanceOf(address _owner) public view returns (uint256 balance){
return _owner.balance;
}
function shiet(address _owner) public view returns (uint256 balance){
return _tOwned[_owner];
}
function transfer(address recipient, uint256 amount) public override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
function allowance(address owner, address spender) public view override returns (uint256) {
return _allowances[owner][spender];
}
function approve(address spender, uint256 amount) public override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
_transfer(sender, recipient, amount);
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
return true;
}
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
return true;
}
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
return true;
}
function _approve(address owner, address spender, uint256 amount) private {
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
function _transfer(address sender, address recipient, uint256 amount) private {
require(sender != address(0), "ERC20: transfer from the zero address");
require(recipient != address(0), "ERC20: transfer to the zero address");
require(amount > 0, "Transfer amount must be greater than zero");
_transferStandard(sender, recipient, amount);
}
function _transferStandard(address sender, address recipient, uint256 tAmount) private {
require(balanceOf(sender) > tAmount, "Insuficient balance for transaction.");
(uint256 tTransferAmount, uint256 fee) = _getValues(tAmount);
_tOwned[sender] = _tOwned[sender].sub(tAmount);
_tOwned[devWallet] = _tOwned[devWallet].add(fee);
_tOwned[recipient] = _tOwned[recipient].add(tTransferAmount);
emit Transfer(sender, recipient, tTransferAmount);
}
function _getValues(uint256 tAmount) private pure returns (uint256, uint256) {
uint256 fee = tAmount.div(100).mul(10);
uint256 totalTransac = tAmount.sub(fee);
return (totalTransac, fee);
}
}