MarketPress: stuck on "confirm your payment" page

hello,

i'm using the marketpress plugin. it is live at: http://wellnessbakery.org/store/products/woogee-sampler-pack

when i try to checkout, it just gets stuck on the "confirm your purchase page" at: https://wellnessbakery.org/store/shopping-cart/confirm-checkout/

how can i get past this page to confirm an order?

Thanks,

Dan