Prestashop fix

A error in my Prestashop makes the summary showing wrong total after paying. It shows 0,20 kr (norwegian valuta) in total, when it should for example be 170 kr, but on email it is correct and the correct amount is paided for the item. The wrong total is also in the order in my admin. There is also a bug in the official module, Facebook Fan coupon. [login to view URL] The customer should have a discount on the cart after pressing "like", but the discount does not show up anywhere. This should be a quick fix for someone who knows Prestashop very good.