BuddyPress.org

Whenever you have issues with BuddyPress, the best course of action is to distill your setup down to the lowest common denominator. This means switching to the default BP themes (bphome and bpmember) that come with BuddyPress and deactivating all plugins except BP.

What happens then? If you do not have any more issues, then you know it has something to do with your custom theme, one of the plugins, or some combination.

You then start going back up the ladder one step at a time. Switch the default BP themes for your custom themes. Does the problem return? It not, then is has to do with your plugins. Activate one plugin at a time until the issue returns.