I don't know what to do next and maybe someone can give me a tip.

I've been working with PageBuilder Pro for a long time and haven't had any problems with any website, both backend editor and frontend editor.

Now I have created a new website with 3.7.14 and some pages only deliver empty content when editing in the frontend editor, everything is okay in the backend.

I have now made the update to 3.7.15 and the problem is still the same.

The problem does not exist on other websites where I still work with versions below 3.7.14.

What could that be?

Joomla and all extensions are up to date, I only use the Helix Ultimate template.

Page with missing content in frontend-editor

Page with content in frontend-editor