What is the deal with the way Facebook will not interact with Rallypoint?

When I see a Rallypoint discussion on Facebook and click on the link, I always have to sign in to my Rallypoint account. I then lose the discussion. I don't understand why I can sign into Rallypoint using Facebook, but I can't go from Facebook to Rallypoint without having to sign in to Rallypoint. Does anyone else have this issue? It seems to be more of an issue when I am using my iPad. After I sign in, I at least should be able to get to the discussion I was headed to in the first place.