marketpress shopping cart no working for customer

A message i got from a customer:

"There is something wrong with your online store. I keep trying to purchase and it continues to say I've skipped a step and asks me to re-enter my shipping info. I tried through PayPal as well as just putting in my cc info manually. I tried through my phone as well as PC."

Here is the link to my site it will expire in 24 hours:

http://shoutkey.com/impressionable

The only option i have set for payments is paypal express checkout and i myself cannot even find a place to put credit card in, however i only go to the paypal screen and stop there when testing as i figured if it goes there everything must be working great.

I cannot reproduce this problem or test a full transaction as i do not have 2 paypal accounts. But i am planning a launch soon so this must be functional.

What could be wrong here?