Checkout as guest bug (skipping address step)

If you add a product to your card and go to the checkout page on pro-draw722x.com and click "continue as guest", it will skip over the address which will result in a bugged UPS shipping step because the step uses the address to figure out the cost. With this bug, people can buy and pay for an item and I have no idea who they are or what their information is, and on top of that shipping isn't included. Anyone else have this bug?