Appointments - TIME DOESNT WORK

The time is off by an hour, this is unacceptable, and the padding option does not seem to really make sense other than add 20 minutes to a service duration?? it isn't allowing a customer/client to book say a 60 minute massage at 11:00am and setting the next 80minutes off (so i can have 10 minutes to get ready and allow 10 minutes extra for the client)