Stripe "Confirm Your Purchase" Screen Broken

Greetings,

We are attempting to process payments using Stripe with MarketPress. The entire checkout process goes fine until we get to the "Confirm Your Purchase" screen.

It is completely void of any form whatsoever (see http://untci.org/img/confirm_checkout.jpg). Sidebar, footer widgets, etc. are all gone on this page of checkout.

We have entered app keys properly, etc. so this is not the issue.

Please advise.