No HTTP response detected and Missing analytics.js script

Hi,

I get an error on all pages in Google Tag Assistent extension.

If I look into GA itself I also see a complete different code then on my webshop. So probably this has something to do with it.

<!-- Global site tag (gtag.js) - Google Analytics -->
<script async src="https://www.googletagmanager.com/gtag/js?id=UA-XXXXXXX-X"></script>
<script>
  window.dataLayer = window.dataLayer || [];
  function gtag(){dataLayer.push(arguments);}
  gtag('js', new Date());

  gtag('config', 'UA-XXXXXXX-X');
</script>

The page I need help with: [log in to see the link]