php - session seems as like it was never removed, even after using session remove + forget+put null

Question

in my code, after saving changes in the project im suppose to clearing the employeNo session after using a lot of method to make sure the session is cleared and checking that it is indeed clear im refreshing the page and it seems the session was not even cleared (look like it put the employee number again in the session some how) because i checked and before the refresh the session indeed was empty

VERY IMPORTANT: this things only happening once in a while, for example - in general the process is working well but sometimes randomlly it happens

tried a lot: (this is from an function that is called by using ajax, POST) this part is in the end of the function before finishing it and then refreshing the page on ajax success part (i also tried to put the refresh in the complete section)

    Log::info('clear');
    Log::info(session()->get('pick.employeeNoGD'));

    while (session()->get('pick.employeeNoGD')) {
        session()->put('pick.employeeNoGD', null);
        session()->forget('pick.employeeNoGD');            
        session()->remove('pick.employeeNoGD');            
    }
    session()->put('pick.employeeNoGD', null);
    session()->forget('pick.employeeNoGD');
    session()->remove('pick.employeeNoGD');
    sleep(2);

    Log::info('after - clear');
    Log::info(session()->get('pick.employeeNoGD'));
    Log::info('end - clear');

and still some how after refreshing the page, it seems that the session was not cleared

when i checked what happens using the logs, it seems that the session indeed was clear

ty for help :D