if you view the source of the page, it is returning an error:
<input type="hidden" name="WADA_RepeatID_product_id_13" id="WADA_RepeatID_product_id_13" value="
Notice: Undefined index: product_id in D:\Inetpub\theartofsergio\admin\update-sort-order.php on line 118
">
This is the hidden element that passes the product id of the record to update. The error is occurring because the recordset used to populate the element does not return the product id column in the select statement:
SELECT cw_categories_primary.category_id, cw_categories_primary.category_name, cw_products.product_name, cw_products.product_sort FROM.......
you need to update the recordset to return the product id column.