Query with id param returns wrong record

When I run a query to retrieve a record from the database, I am passing an id param but it is returning with an incorrect record:

with this query:

    $idusers = \DB::table('users')
            ->select('users.*')
            ->where('id','=', $id)
            ->get();

I am passing id = 91TDFS78 and the result is actually for the record with id = 91.

via nabil