php switches my tinyint value

Question

Im new to php and with working with mysql. I have table with users information: databse

In login I get execute query, get all information: my php

$query = "SELECT * FROM `users` WHERE `username` = '$username' AND `password` = '$password'";
        //$result = mysql::query($query);
        $rows = mysql::select($query);
        // If result matched $myusername and $mypassword, table row must be 1 row

        if(count($rows) == 1) {
            $_SESSION['login_user'] = $username;
            if($rows['admin'] == 1) {
                $_SESSION['admin'] = true;
            } else {
                $_SESSION['admin'] = false;
            }
            header("location: index.php");
        } else {
            $error = "Your Login Name or Password is invalid";
        }

and then I log user in, it logs in all perfectly, but then I try to read if I'm an admin, and my tinyint value always the opposite other than it's in database.

Maybe it is something that php does, and I should switch my if permanently, or it's my fault?