If you choose not to block dates of not yet paid booking requests in your calendar, you can receive multiple booking requests for the same period.
You can accept or pre-approve multiple booking requests for the same period. In this case, the following applies: first comes, first serves. So who-ever pays first, is the lucky one. The other booking requests will automatically be declined. These declinations have no negative impact on your ranking.
Change your Availability settings if you wish not to receive a booking request for dates that you have already received a booking request.