Public side dynamic page initially loads but then contents disappear/return 'Error 404' on part of the page

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1

This is what appears when I access my published dynamic page:

1985×1809 505 KB

From the preview editor, it looks like this:

1977×1820 568 KB

Any ideas?
I have other dynamic pages formatted similarly, and they look fine when published. I’m not sure what to do.
Any thoughts and suggestions are welcome.

2

For some reason it is showing part of the default Wix 404 error page.
https://support.wix.com/en/article/about-the-wix-404-error-message-page

There is a recent previous post about this too.
https://www.wix.com/corvid/forum/community-discussion/custom-404-page-issue

3

The page I built is not a custom 404 page, though, it’s a normal dynamic item page showing contents of a dynamic dataset and underlying collection (as you can see in Preview Editor).

The dynamic content loads, stays on screen for a fraction of a second, then it snaps to the above.

Funny thing is, the title in large purple font (‘Hullywood’) is part of the dynamic dataset, so I’m really confused as to why this is happening