Sub-Total Order calculated twice

[devillz]

Hi,

 

I'm new here and to osCommerce.

 

I've just successfully installed (i think) the Discount Coupon Codes http://addons.oscommerce.com/info/4269/v,22 .

 

What i've realised is that on the order confirmation page, the product's price are shown correctly, but on the sub-total order it's always double the price.

 

I'm not sure whether this takes place after modifying some codes on the files and hoping someone could give me a hand here.

 

Any help will be much appreciated.

 

thank you