When I put more than 1 qty of an item and then run the shipping estimator, it doesn't multiply it by that amount. Example: Item A weighs 6 lbs and ships for 9.47. When I put 3 in the cart for the same item, update the cart and then estimate shipping, it shows it correctly at the top as 3 items for 18 lbs. But down at the bottom where it calculates, it says 1x6lbs. Why wont it calculate it as 1x18lbs?