azira sent a note to Keleth
Then that is probably a bug. But since we are discussing it, we could treat this as documentation, and then it's a feature, right? ;)
I would be careful when "fixing" it though, there's a danger in breaking existing games if you enforce it (except if you just limit the adding/inviting of new players). My take on this is that it should be GM discression though. If a GM adds more than the "cap" I'd assume he knows what he is doing. Alternatively you could ask if the GM wants to increase the cap, and then only add the player after increasing the cap.