Shopping Cart

Hey There agin! Recently I discover an issue with a shopping cart so:

When Im login as an admin of my wp site all works perfectly I'm able to adding the products play around with the shopping cart I can check out using Paypal live etc!

But when Im log out or go to the site from other machine shopping cart works I'm agin able to add products etc. but I can't check out right after clicking continue check out it shows "There are no items in your cart.
Browse Products »"

We want use the shopping cart with out logging in,

Here's the site http://masterminds-ec.com

What should I do ? Thanks