Oxygen Builder conflict? | Not retrieving posts | No preview

Hi, in the past I used your plugin -alongside OceanWP- to display related posts based on categories.
Now I’m redesigning the site with Oxygen Builder, which it’s a ‘themeless’ builder, meaning it doesn’t load any theme at all. The related posts are not displaying.

May that be the reason or it’s something else? I have no conflict between Oxygen and others plugins, so that means the_content() function it’s properly working. I guess it’s something else.

On the plugin settings, I’m also not able to preview the ‘real time preview’, neither by changing settings or clicking ‘REFRESH HERE’, so I’m guessing it’s not retrieving the posts?