“I don’t really know any of you well enough to share a room with you,” Moon said frowning and looking at all her Male comrades, “nothing personal but… I think I will find my own place for the night.”
Not a miscount, just bad phrasing. Assal has got four rooms, each with two beds, since not everyone would want to share a room, and since he isn't hard up he decided to get more rooms than strictly necessary.
I've edited to try and clarify that