Canadian shipping address' not working in checkout

[yongkoom]

I have a problem with my checkout process that I cannot figure out... can someone help?

The checkout process appears to work perfectly for everyone in the world EXCEPT for anyone with a Canadian address.

If I create an account with a US shipping address and billing address, everything processes correctly, if I add a canadian shipping address and try to send, the checkout process will not proceed past step 3 order confirmation. It just loops back to step 2 for me to re enter billing address.

This happens with all Canadian orders regardless of the card or billing address used, but as I said everyone else in the world has no issues.

Any Ideas on what this issue could be, or where to start looking?

Here is the URL.. http://cycleaware.com