Form not working with subscription add on

I have developed a form at https://northamptonsoccerclub.com/registration/nsc-online-registration/ (password NSC2013). Since I added the Subscription Add-On, it will no longer redirect to Paypal upon Submit although the entries process and email notifications are sent – I have noticed that the registration confirmation email no longer contains the value of the “Club Fees” chosen and the Choose Payment field under the form submission says “Array”.

I tried defaulting to the 2012 Theme and turning off all other plugins with no change.

I also made a simple test form that worked correctly until I added a subscription payment.

https://www.ads-software.com/extend/plugins/gravity-forms-subscriptions/