Billing address not match problem?

Hi. I just setup my website. Now everything working 1 thing.
If I checkout with Paypal using paypal account without creating user account on my website then everything smooth.
But when I try to check out with paypal account after creating user account on my web site then it always says check billing address.
Your billing address is shown to the left. The billing address should match the address on your credit card statement. You can change the billing address by clicking the Change Address button.
I entered my address correctly. So I don't know what to do.
THank you

The billing address matching or not matching is a decision made by the credit card company at the time of the transaction. And I have seen the decision change from month to month on the same customer. Its usually with an American Express card. One customer simply took off the extra 4 digits of the zip code to get the match to work.