@Jacqueline610 @Ana1136
Jacqueline, unfortunately this is an ongoing problem and one hosts have had to contend with ever since Instant Book was introduced. Many representations have been made to the company to fix this issue but, to this point our concerns have fallen on deaf ears.
What is happening, you set your booking window to, lets say, 3 months and an event comes along outside your booking window which you block on your calendar....it may be 4 months down the track. As the rolling booking window comes to that date that you have blocked it automatically opens it for booking.
At this point the are only two ways around this....
1/.....Set your booking window to 'All future dates' and you can then be confident the rolling booking window will not come into effect!
2/.....Disable 'Instant book', all booking requests will have to be approved by you.
As Ana says, this is a well know issue with CX so, get onto them and explain and they will cancel this booking as a neutral cancellation....you won't be penalised.
Cheers......Rob