Available time not showing up on booking page

Hello!

I have been using Bookings for quite a while now. Suddenly there are time slots that I know I have free that are not available when clients go to book. I have checked all my calendars to make sure I don’t have something booking me off and I cannot see a thing. For example, all my calendars show me free next Tuesday but there are no slots available on the booking page in the afternoon? Any suggestions would be appreciated!