Correction. Buddypress uses a slug of “forums” and bbPress defaults to an Archive Slug of “forums” causing a potential conflict between the two. Oddly, the conflict manifests itself in a mystery sidebar being created. An incredibly strange event, to say the least.
You have a bug. Buddypress uses the word “forums” but so does bbPress. You get a conflict in the bbPress settings (something no-one would ever notice). I changed the name and saved and voila! No more sidebar.
