BuddyPress.org

Oddly, posts by all users are visible in the general Activity stream for the entire site, just not in the individual Group activity streams. And…

If User A posts to a group, user B only sees it in the general site Activity stream and can post a reply there, but then if User B goes back to the group, User B still can’t see User A’s post even though it now contains a reply from User B (user B can’t see the original post or their own reply to it when viewing the Group activity stream, only in the site Activity stream).

Hope this makes sense… : )