BuddyPress.org

Afraid not sure what to suggest with this, can’t personally recreate this type of issue on custom test installs. I assume that you have the BP theme files copied over and adjusted and that nothing necessary for BP has been inadvertently removed -although that’s doubtful.

It’s going to be hard to help with a third party custom theme, without having all the pieces to hand as it were, hopefully one of the others will chip in with some thoughts or perhaps even have a better idea why the issue could happening.