Problem with save changes in page builder: no additional sections possible

I made a page with a few offers for cars in page builder. At least there are 6 offers but I need 12. After this I can not add any section!
For example I copy the last section and after saving it ... it disappears!
I tried to build up the page again new, but the same ... after the 6th car it is not possible to add any sections.
Anybody knows how to fix it?
The page:
http://oldtimertours.rocks/wordpress/oldtimer/

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