Time increments changing after a meeting is booked

I have a Bookings calendar that has the time increments set to 30 minutes and the length set to 1 hour. When a meeting is scheduled at lets say 1-2pm the available meeting times change to 10 minutes later. We do not have any buffers setup in this service and not sure how it is changing. It only seems to be happening to one of the staff assigned to the service and not the other. I have attached a screenshot of the changes that happen. Any ideas what is causing this?