Query is being cached - mysql

Question

Hi guys I'm having a strange problem, and I'm looking for help.
I'm using laravel 7, and one of my queries apparently is being cached or something, here's my code to explain:
Here's a very simple method in one of my controllers:
public function chartEstadosVoluntarios(){
$estados = DB::table("voluntarios")
->selectRaw("estado, count(*) as total")
->whereNotNull('estado')
->groupBy("estado")
->get();
return response()->json($estados,200);
}
If I hit the route on chrome the result is:
[
{
"estado": "Derivado al 147",
"total": 2
},
{
"estado": "Derivar a mesa de ayuda",
"total": 7
},
{
"estado": "Pendiente",
"total": 3
},
{
"estado": "Reasignar Adulto Mayor",
"total": 50
},
{
"estado": "Resolución logística 24hs",
"total": 4
},
{
"estado": "Resuelto",
"total": 119
}
]
But its wrong, its not the real result, here's a screen for the same query in MySQL Workbench:
I'm using the same user in workbench and laravel.
Another thing is that If I slightly modify the query, then i get the correct result, for example:
$estados = DB::table("voluntarios")
->selectRaw("estado, count(*) as total, 'test'")//adding 'test' to select
->whereNotNull('estado')
->groupBy("estado")
->get();
Then I hit the browser again, and the result is:
[
{
"estado": "Pendiente",
"total": 9687,
"test": "test"
},
{
"estado": "Resuelto",
"total": 16415,
"test": "test"
}
]
If i go back with the modifications i get the wrong results again.
So, I really don't understand what's happening, Any point of direction will be appreciated.
EDIT, more info added from the answers:
the toSql() method throws the same query (copy pasted from the browser):
"select estado, count(*) as total from `voluntarios` where `estado` is not null group by `estado`";
The toSql() method with 'test' in select:
"select estado, count(*) as total, 'test' from `voluntarios` where `estado` is not null group by `estado`"
Same results in Tinker:
Downgraded from laravel v7.10.3 to v7.6.2 (the one that i have before running composer update today), but the problem remains.
EDIT 2
Weird thing happens, I recently use another part of the system that edits the "estado" field of table "voluntarios" to see what happen, and now the query throws the correct results. it's like something has been unlocked after editing the table.
What could it be? I check before that the user had no open transactions.
Thank's in advance.