I think there is a small bug in the Structural Drafting and Detailing forums.
If you bookmark them as favorite places they'll appear as Analysis and Design Forum (which gives me 3 different Analysis and Designs in my favorite places).
Hmmm... maybe I do not understand the workflow you are using. When I go to that forum and click the Add Group to Favorites link, I only get that forum in my Favorite Places. Could you identify the specific steps you are using? (to see if I am doing something different...)