Delivery/Billing address switched??

[ristretto6]

So I just had a customer contact me and tell me that her order was shipped to her billing address, rather than the delivery address she specified at checkout. I looked at my confirmation of her order, and saw that we had correctly shipped the order to the shipping address specified. But then she forwarded me her version of the confirmation, and the two were switched! i.e., what she had put down as her billing address showed up on my order form as her shipping address, and vice-versa. I looked through my past orders and saw that none of my other customers had different shipping/billing addresses, so possibly this is the first time this has come up and I just didn't realize this had been the case all along, but it appears that when Prestashop submits the new order information to me, these two fields are switched and I'm getting the wrong info.

How/where can I change this so that it submits new orders to me correctly? (I haven't upgraded to the newest version yet)
Thanks!!
-lindsey