WP Bakery issues // Editing only possible at selective points

Hey all,

I am using the Ave Theme by liquid-themes and i try to edit the page with the WP Bakery Page Builder but most of the fields/sections I want to edit are not editable. When I try to edit them the loading button appears but afterwards nothing happen. Interesting fact is that not all fields/sections are affected.

Anyone an idea to solve this problem? Reinstallation or is there another way to solve the problem?

Thanks!

Markus

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