Grey space above menu

Dear support staff

For some posts, I’m using Visual Composer. When I insert this prepared content to a post I see a grey bar above the menu which is about 10px, even if I disable “Page heading” in the post settings.

Now I would like suppress this grey space, so the heading row is on top.

Please refer to this site to see what I mean by that:

http://www.stefanhengstler.de/test-kategorie/24996/

Thank you very much for your assistance

Best regards