Detecting tablet and mobile

I’m using this plugin of detecting mobile/tablet devices.

I used this script to detect tablet devices:

<?php if ($page->isTablet()): ?>
  <h1> tablet </h1>
<?php else: ?>
  <h1> desktop </h1>
<?php endif ?>

It works good when I’m on iPad mode in the developer tools, but when I use a real iPad nothing changes. Any idea why?

BTW in mobile devices it works good both inspect and the mobile device itself:

<?php if ($page->isMobile()): ?>