Not able to reserve service and time slots

I have a website where I am trying to use Appointments+. I have a list of services and 15 minute increments for services being 15, 30, 45 and 60 minutes. This is important because there are some services that literally take 10 minutes and then there are those that take 45 minutes. When I try to test the system, Appointments+ shows only the top service listed and 15 minutes regardless of what is selected. Please advise. I am afraid I am doing something wrong.
Here's the link: http://jspabeauty.com/make-an-appointment-2/
I appreciate any help you can give.