Profile: stefanM-6

Problem:
The issue here is that the user's theme is generating a sidebar on his custom posts.

Solution:
I suspect that this has to do with the theme's template file.

Normally your theme has a sidebar() function that renders the sidebar. What you can do is to create a custom php template for your custom post type and remove the sidebar(); function from that file.

Naturally you will just create a copy of the single.php file and create your custom template with the name single-{cpt_slug}.php