BuddyPress, bbpress and hidden group forums


I have BuddyPress Corporate Child theme Version 1.4.7 with BuddyPress 1.81 and bbPress 2.5.1 installed. WordPress is version 3.7.1. Site access is restricted to visitors who are logged in or allowed by IP address. Users who are not logged in only see public posts.

I created a hidden group with a group forum. When I’m logged out I can’t see the group or the group forum BUT I can still see topics from the hidden forum in the bbpress recent topics widget and in different lists (most popular topics etc). I’m not able to access the topics, but I feel that even being able to see them is bad enough.

Any ideas how I can solve this?