MarketPress & Stripe - Stuck after submitting payment

We've just launched this website: https://recessdumbo.com/playspace/products/

We have Membership Pro running for the membership, Event Espresso for the Events, and MarketPress is supposed to handle the Drop-In Pass & Play Packs

However, MarketPress is getting stuck after submitting the credit card information. I have MarketPress set to use Stripe. The payment goes through but the page doesn't load a confirmation page or redirect anywhere... just has the 'loading' page.