@Ellen880
There is something weird on your listing: it can only be booked for 2 nights.
Also 1 or 2 guest can book all three rooms !
Please note you offer the "no refundable" option to guests (10% discount if choosen)
Maybe review your listing before starting with bookings.
If you want to offer 3 rooms, you need to create a listing for each room or for each combination of rooms (and then link the calenders)