3D FlipBook - 3D FlipBook - Not working, shortcodes and programming have been deleted

I have been running 3D FlipBook since 2022 on my website. Currently I have 10 different FlipBooks. I am running WP 6.8.2 with theme "Divi" from Elegant Themes, so far it has worked perfectly.

Since approximately two weeks all my FlipBooks have vanished from all my published pages. It is not just that they are not showing when browsing, they have vanished. When I go into editing mode, the WP-segment/block where I had published the shortcode are not longer there ´they have been auto-deleted (not by me) (This goes for all locations on my site.)

I have tried to create a new block and inserted the shortcode - nothing happens, it doesn't load the FlipBook when I browse the page. (The "block" is still there when I change to edit-mode, but no functionality.