One reason could be because you've changed a listing's default check-in and check-out times.
In this case, the changes won't apply to existing reservations.
On some occasions, Airbnb guests have the option to select a different check-in/out time from the default time that has been chosen when the listing was set up.
The user will have this option in the following scenarios:
- If the listing's check-in/out settings are set to "flexible", the guest can edit the check-in/out time during the booking process. This will change the reservation from Instant Book to Request to Book.
- If a guest creates a reservation within 48 hours of the check-in date, Airbnb offers them the option to select a custom check-in time, which may be outside of the host's defined check-in window. If this happens, the reservation will come in as a Request to Book.