I had the same problem and then found that when airb&b booked guests into one 2 bed property it automatically blocked the dates out on my other 1 bed property. Here is the answer if you want to link and if you don't.
(1). Go to your Dashboard (Home page) Select Listings. (2). Click Availability and Pricing. (3). Scroll to linked calendar availability then click EDIT. (4). Click create linked calanders create linked calendar. The listing you select will become the Parent listing. (5). Click NEXT. (6). Select any other listing you want to link to the Parent property. (7). click SAVE. TO UNLINK your properties from each other. Follow all the same steps above except UNSELECT the tick box on step (4). and click SAVE. The link will be removed. You will then have more control over your bookings in each property. I only wish I found this out earlier because I have missed out on loads of bookings due to mine being linked. Happy hosting!