Sleeping arrangements what is a double bed?

How many people does OwnerRez count a double bed can sleep? I would assume 2 but now I keep getting this error message " Max guests rule (10) is different than sleeping arrangements (8)"

There's a King, Queen, and 3 Doubles = 10 sleeping spaces right?

Yes, Double beds sleep 2.  Your logic seems correct, so, please write in to the Helpdesk with information about this problem so we can investigate and figure out what's going on.