Hey there!
Nope that’s definately not the issue cause all the collapse shortcodes are set to a black background.
I also adjusted the settings as you suggested to Always make them black. Didn’t solve it either.
Hope you have any other suggestions.
Some useful information, a theory of mine which I will test asap is that the shortcodes somehow have difficulties with my custom posts. The Biography is a custom post made with Toolset’s Types.
I’ll see if the collapse shortcode behaves differently on a page. But I’ve noticed some difficulties with the custom posts also with navigation_position=”none” not working on my custom posts shortcode as well.
Somehow on pages the shortcodes work alright, but inside custom posts they do not work 100%.
I’ll keep you up to date with the results from my testing.