会话变量不会在每个页面上更新

On my website, there is a function for logging in and logging out. Upon login, I set the session variables pass (which is hashed password), uid which is the ID of the user logged in and loggedIn (boolean):

    $hashedpass = **hashed pass**;
    $_SESSION['pass'] = $hashedpass or die("Fel 2");
    $_SESSION['uid'] = $uid or die("Fel 3");
    $_SESSION['loggedIn'] = true or die("Fel 4");
    header("Location:indexloggedin.php");

On every page, I check if the visitor is logged in by

1. Checking the status of $_SESSION['loggedIn'],
2. Searching the database for the user with the ID $_SESSION['uid'],

3. Checking if the hashed password in the database matches the hashed password in the session variable:

   $sespass = $_SESSION['pass'];
   $sesid = $_SESSION['uid'];
   
   $sql2 = "SELECT * FROM `users` WHERE `id` = '$sesid'";
   
   $result2 = mysqli_query($db_conx, $sql2);
   $numrows2 = mysqli_num_rows($result2);
   if ($numrows2 != 1) {
       $userOk = false;
   }
   while ($row = mysqli_fetch_array($result2,MYSQLI_ASSOC)) {
       $dbpass = $row['pass'];
   }
   
   if ($sespass != $dbpass) {
       $userOk = false;
   } else {
       $userOk = true;
   }
   

My problem is that this seems to be working on some pages, while it doesn't work at others. For example, when I log in, I am instantly logged in to the homepage, but not to the profile page. However, after a few reloads, I am logged in to the profile page as well. The same thing happens when logging out.

For testing purposes, I tried to var_dump the password variables as well as the userOk status on the index page, and this is where I noticed something interesting. When I log out, the password variables are set to be empty, and $userOk is false, according to what that is shown at index.php?msg=loggedout. But when I remove the ?msg=loggedout (and only leave index.php), the password variables are back to their previous value, and I am no longer logged out... After a few reloads, I am once again logged out.

Why is my session variables not working as expected? It feels like as if it takes time for them to update, which is very weird. I have tried with caching disabled (both through headers and through the Cache setting in my browser).

Just tell me if you need more info.

You have initialization session_start() on every Site?

session_start() creates a session or resumes the current one based on a session identifier passed via a GET or POST request, or passed via a cookie.

After contacting my hosting provider, it was actually a hosting issue. It is now resolved!

Thanks,
Jacob