Howdy, Is it possible to get the times to match the times

Howdy,

Is it possible to get the times to match the times displayed on the calendar (http://islandrolfing.com/book-a-session/) when entering an appointment manually? I have some code in functions.php that is adjusting the appointment times displayed on the "book a session page."

Times when manually entering appointments manually do not correspond, see attached image. If they could match i.e.: 9:00 am - 10:20 am, 11:00 am - 12:20 pm, 1:00 pm - 2:20 pm, 3:00 pm - 4:20 pm and 5:00 pm - 6:20 pm that would be perfect.

Cheers,
Casper