@Susie236 Undo and then redo your calendar imports. I saw the same thing a few days ago where the month of December appeared completely blocked/booked. Removed the sync, waited a few hours and then redid it. No issues.
VRBO and AirBnB do tend to step on each other from time to time... I check and review the websites daily just for that reason. It is a PITA, but better I spend my time than lose a guest.