Hi,
I’ve just made some more tests.
I cleared all the elements and then insert a saved template that is being use on many other pages successfully. The results are still the same, broken css and missing elements.
We actually imported lots of pages, using the page builder short codes and then activating the page builder with a bulk custom field editor. This works fine in English, and for most pages in the other languages. Only some pages seem broken.
But, the recent test I have just done excludes import errors also. Happy to give you admin access if you need it.