Page loading not correctly

After I duplicate my page and change all the content I save the page. Somehow the page is loading not correctly and I get all the content in half. I can resolve this by placing an empty row next to all the content but this takes ages and I want to know what causes this problem.

See here an example:

How did you duplicate the page?

Beaver builder > left corner (tools) > Layout duplicate

Sounds like there might be an unclosed element in the page

This does not happen everytime. It only occurs on 1 of 50 (duplicated) pages