Hello Nuria,
PageBuider is a very good tool. Even if some things annoy me a lot and there are still a few bugs, it's a good tool to work with. But some things just don't work, no matter what you do.
I've looked at everything and I think I understand what you mean with your two questions.
I am not part of the JoomShaper support team, but I would ask if I could have access to Joomla/Pagebuilder. Then I could take a look at it. It's quicker than writing a lot.
If you trust me, then create a new user with admin rights. Assign a username and password and send it to me via “Hidden content”. Then I'll take a look at the page.
If not, we can only make progress with the solution bit by bit, and it will take time, especially as the time difference is very large.