@Debra300 Wow, what a mess. I've only ever had one listing, so never had to deal with the faulty algorithms of this. It's funny, when I first decided to list on Airbnb, I was thinking of listing both my bedroom, which is larger and has a queen-size bed, and the smaller guest room, thinking I'd just vacate whichever room was booked and move into the other (I'm a minimalist, it takes about 20 minutes for me to move my personal stuff to the other room- I've done it when I had friends or family stay).
But I had no idea if it was possible to set it up on Airbnb so if one room got booked, the other became unavailable. I asked in a message to Airbnb, and got 2 answers from "community experts"- hosts who basically act as CS. One told me it wasn't possible at all, the other told me that it was, and easy.
But being a non-techie person, the idea of syncing the calendars seemed daunting to me, so I just listed the guest room.