Need to get out correct values from a database

Hi I need someone to make a correction in the database. When i have received an order and i want to update this order by adding a product, the total order calue in the database in table "orders" is showing wrong value. It shows the order total which was when the order was put in (not updated). However the updated correct total order sum gets stored in table "orders_table". So the value which is in table "orders_table" must be the same as shown in table "orders". I can show you an example. Good communication skills. No hardcode. Must know the zen cart system. I need someone who can work fast and someone who is humble. In future i hope to have you as my programmer too.