When Johnny shows Stevie that the hotel is fully booked, it lists the Rose family as being in rooms 7 and 8. It's been established that Johnny and Moira are in room 6 and David and Alexis are in room 7.
When Johnny is showing the reservations to Alexis on the computer, it says that Damien Steele (Roland) booked room 10 but later when Roland arrives, he gives him key to room 4.