17481 oscommerce fix

hello all of a sudden one of my carts keeps erasing products on my/customers orders. It only keeps one at a time. Every time we purchase another product it erases the one before. This is a big acct so speed on this project is a must. I've copied/changed my [login to view URL] from my other sites but still have no luck in getting this bug fixed. I've read all the forums and followed their instructions but no luck. Also this cart doesnt not have an ssl acct. My 4 other carts still work fine and i wasn't doing changes on this site so i have no clue why it's not keeping the products in the order.