ShopSite adds a new line item when shoppers order multiples of an item by clicking the Buy button each time. This causes confusion at the warehouse level, when packers see the same items duplicated on an order. Even the warehouse software is set up to flag for seemingly redundant items). There is already a discussion forum on this, and while there are reasons not to do it, there are reasons to do it as well. It is standard on other carts. It should be an option for ShopSite.
Here is the discussion link. http://support.shopsite.com/forums/viewtopic.php?f=1&t=8339