Marketpress checkout not going to confirmation page

This is for

I'm having customers have multiple orders go through because when the "Submit Order" button is pressed the order goes through after the loading wheel loads but the page doesn't change.

Screenshot 1 shows the page after the button is pressed and the loading wheel disappear.
Screenshot 2 shows the order goes through.

Why is this happening, and how can I make the process go to the order confirmation page?