A period of time showed up as blocked on my airbnb calendar after API integration with OwnerRez. I can't find these dates as blocked anywhere in Ownerrez, don't have channel blackout dates set either. When I disable the API connection I can clear these blocks of the airbnb calendar. As soon as I re-enable and sync, the blocked dates show back up again and I can't figure out where they are coming from.
That sounds like potentially a problem in the Airbnb system - you may want to reach out to their tech support. If that doesn't help, please send us full details to our Helpdesk and we'll assist with the investigation.
Another possibility is that you have an active iCal import from Airbnb - you don't want to have that if you are using the API, as it can create infinite loops.