Visual Composer - responsive and non-responsive pages


I have been asked to make changes to an existing site.
The theme seems to be a custom one - that uses Visual Composer.

Most of the pages are responsive, and look fine on a mobile device.
Two of the more recently added pages (not by me) are not, and I’m trying to figure out the difference.
When I simply compare the Visual Composer layout they look similar.
But when I try to edit any page components, or columns, on the non-responsive pages, the edit window pops up, but is blank - there are no options.
When I do the same with a working page, there are tons of options.

I’ve tried adding new content (eg page section or column) but I still get no options…


Thanks :slight_smile: