@Julia2608 Sounds like user error to me. If the dates are wrong in an inquiry, you can modify them by clicking on Special offer and changing them. The guest will have to accept for the booking to be processed. I tried choosing a bunch of dates on your calendar, and nothing appears to be wrong. In terms of being told its reserved and being asked to make payment, I'm guessing it's just a misunderstanding because if you send a booking request, the system will ask for a credit card number. Are these guests all new to Airbnb, by any chance?
Your calendar is available for booking for all future dates.
If you have questions about how your listing looks to the guest, just go to your listing, then click the Preview button. Alternatively, you can sign out of Airbnb then find your listing as a guest would, but searching via location.
If you want to contact Airbnb to verify, you can reach them a variety of ways: see https://community.withairbnb.com/t5/Help/Contact-Airbnb-A-Community-Help-Guide-UPDATED/td-p/413245 for details on how to do that.