Calculation widget is not working in my form

I've created a registration form and inserted a link to our Paypal account. The registration form includes multiple choices for activities during a conference. I have inserted the calculation widget/button and tried to make it connect to the payment button, but the two are NOT working. Still show zeros when I do a test run. And, though the form is "submitted" it is not linking into the calculation and payment sections.

Unfortunately, the calculation widget will not work with the checklist widget so you'll need to use regular radio buttons/checkboxes to be able to make calculations based on the selections made.

You can check here: http://form.jotformpro.com/form/51727264383964 a cloned version of your form with a working widget. Feel free to clone it to your account to check it further.