MYSQL DELETE INNER JOIN only shows deletes after page reload - html

Question

I have managed to get working a Duplicate field Check using INNER JOIN with PHP MYSQL , however the delete only shows after a page reload , the 1st time i load the page the duplicate entry's are shown then i reload the page and the DELETES are no longer showing. i dont understand why, does this code show any reason for this to happen? a page refresh does not happen no matter what code i use, nothing is run during the IF ($RowsDC >1) check other than the DELETE statement
here is the code:
while($row = $stat->fetch()){
//checking for duplicates
try {
$db2 = new PDO("mysql:host=localhost;dbname=classifieds2", 'root', ''); // 1. set database with this instead of conect - or change conect to this
$db2->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$queryDC="SELECT * FROM listings WHERE listID = ? AND UID = ? ";
$statDC=$db2->prepare($queryDC);
$statDC->execute(array("$listID","$UID"));
$ResultDC = $statDC->fetchAll();
$RowsDC = count($ResultDC);
if ($RowsDC >1){ $db2A = new PDO("mysql:host=localhost;dbname=classifieds2", 'root', ''); // 1. set database with this instead of conect - or change conect to this
$db2A->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$query01DC="DELETE a FROM listings a INNER JOIN listings a2 WHERE a.id < a2.id AND a.listID = a2.listID ";
$stat01DC=$db2A->prepare($query01DC);
$stat01DC->execute();
??? here i have tried to refresh the page but it does not no matter how i try nothing is run ???
}
}
catch (PDOException $e){
$_SESSION['message']="Database Error #vbmDUPCHECK2 <br> <h6><h6>Signed Out For Security Reasons</h6></h6>";
$_SESSION['loggedin']='000';
echo $errorcall;
die();
exit();
}
}//WHILE END