My shipping is messed up.

The shipping is charging about half of what the actual is.

What are the settings for correcting this?

I have noticed that this happens when someone uses Google Checkout and GC is not returning them back to my site. I have run through the sequence and there is a link after paying to return but, Zen doesn't create an order.

I do have 0-rings on my site for $0.50 ORG03 if you'd like to pretend to buy something.