@Moira21
it seems there was/is a glitch with calendars lately.
Today our guest wanted to book our place and his calendar was messed up showing wrong days/dates. For example, May 11th is Saturday but the calendar showed it as Sunday. Nonavailable dates were shown as available.
He sends us his screenshot and it looked different than on my mobile phone (mine calendar on mobile and on desktop works fine)
One host posted he received 2 bookings for the same dates, both from Airbnb, both in the same time.