@Fatima421 There's a very high likelihood that at least some of these guests booked without realizing the home is a shared property. You do spell it out in your description, but a huge portion of guests hit the Book button without reading the text. If someone was just going by the photos, they would assume that they're getting a private pool house. If these bookings are still within the grace period for free cancellation, I'd recommend contacting them to make sure they're 100% aware of the arrangement and reminding them that if it isn't what they thought it was, they can act quickly and get a full refund.
A nice swimming pool is one of those amenities that some people go nuts for - they see that up front and it blinds them to the details. That's great for getting booked quickly, but you don't want guests showing up on your doorstep wondering why your family isn't leaving the house. So in addition to turning off Instant Book, I recommend including some discussion of this being accepting bookings. A significant portion of the guests will withdraw their requests, which will be disappointing at the time but it will spare you some huge headaches.