WTH happened with this order.....??

I received an order for 67.90 + 6.62P&P

… Which was paid for using Google Checkout, and I had the following messages from google…

14:01 : “The customer’s credit card was authorised for £74.52 and passed all risk checks.”

14:01 : “You initiated a charge of £67.90 to the customer’s card.”

14:01 : “The customer’s credit card was successfully charged for £67.90.”

Which means they had free shipping. Not the end of the world… But how can I stop it from happening again?

Bug found… There is no section for shipping, so i cannot store the tracking number, on this order.