Hello @Marielle-Nadia0,
Did someone whom you did not host leave a review?
Did the guest have a reservation with you and they cancelled it?
Guests can now leave a review if they cancelled the reservation on the checkin day or after checkin.
If the guest had a reservation and cancelled it before checking in you can leave a response saying that the guest never stayed with you.
You can contact Airbnb support to discuss things.
contact_us
or
Contact-Airbnb-A-Community-Help-Guide-UPDATED
Steve.