|It sounds as though the issue is with the games site, not your end or facebook(though its possible that its a certificate issue). Have you tried contacting the owner of the game site? It sounds as though you could access this information through the sister site since you are able to access that. It is always possible that they are having trouble, or perhaps even updating.|
If you haven't/have checked that out, either way what was the name of the game, as there are several hundred different options I could guess from.