On payment page it's doubling the quantity of everything.

Several people have not been able to register or double paid.  It's been a mess!

Sorry for the inconvenience. I have just tested your form and noticed that the item selected is shown twice in the Paypal page

Can you try removing the PayPal gateway then adding it again.

I did what you suggested.  It didn't fix the problem, but helped me figure it out.  I think when I integrated it on the form from saved info having used it on a previous form - for some reason it had all of the options on there twice.  So if you checked it once, it automatically counted it two times.  I went in and deleted the duplicate fields and I think the problem is fixed now.  

Glad you where able to resolve the issue. If you require additional assistance, please let us know. We will be glad to help.