Dynamic pages getting 500 error and mobile view directing to old page

Question:
Hi!
I just published my new site on www.peterfriisjohansson.com

Everything was working perfectly on the old adress (pet264.wixsite etc) but as soon as I published to this domain and thereby replaced my old webpage all dynamic pages (concerts, recordings, projects) stopped working and are now giving a 500 error. Static pages that connect to CMS (home, media) still work.

Second issue is that while on mobile, my old page design is still shown. Again, the new design worked perfectly before publishing to this domain.

Product:
Page created on Wix Editor.

What have you already tried:
I followed this guide on the concerts page and the page now loads but goes to 500 error page as soon as it’s finished loading.

Using desktop view on a mobile device I can get to the desktop version of the new design, and then disabling desktop view I can access the new mobile design. So it is in fact there but accessing th site directly on a mobile device gets one to the old design.

Have you changed the URL structure in the dynamic page settings?

Do you mean as a fix or as a cause for the errors?
I have indeed edited the URLs on some of the pages before publishing.

Go to the dynamic page, then the settings, it should be right beside the SEO settings, there you will find the page URL structure. Check if it is same as the live dynamic page URL

Yes the URL structure is the same, at least as far as I can tell.

At this point, you can try a few things -

  1. Re connect the elements, especially in mobile.
  2. Clear the cache
  3. Sync all items.
  4. Check collection permissions