I've recently upgraded to 1.3.9f and have just noticed some problems with shipping. I get the shipping options I am suppose to get when proceeding through checkout. No matter what option I choose, the confirmation page shows Parcel Post as the shipping method. But I also noticed, when I add 18 or more items to my cart, no matter which shipping method I choose, the confirmation page shows a Medium Flat Rate box as the shipping method. I do have the flat rate cloned. Any help would be greatly appreciated.