Oscommerce Cross Selling Issue

Our Oscommerce has cross selling contribution installed. Facing problem with it. In the admin panel does not matter how many cross selling products are defined, front end always shows only one item. If we remove all the cross selling items, still it shows one item. But if there are no cross selling items defined ever, then there it works fine by not showing any cross selling item in the front end. Must have solid understanding of Oscommerce.