Empty content

The import finds 12 posts and 17 pages, but it imports only the titles, the content is empty. Is it not working with Gutenberg Blocks?

Can you tell that by looking at the site if it’s something with the original content? Doesn’t look special to me from the sourcecode. (I currently don’t have backend access to look how it’s set up).

Also the contents from http://www.arzneimittelfonds.de/projekte are missing completely, is that a custom post type I’d need the premium version for?

The page I need help with: [log in to see the link]