sub total in cart wrong when attribute used

[janjansssen]

Hi,

I've got an item with a price of 0,50. I've modified the "price per letter attribute" so this is used as a field to calculate length. So customers can fill in "1000" and it calculates the price per letter times 1000 as the attribute price. So with this example, when I order 1 item, with length 1000 the total in my cart should be 0,50 + 1000 * price per letter (let's say 0,00030) = 0,80. But my total in my cart says it's 0,18. Thats 60% of the total attribute price..... I'm totally stuck here...

Link: http://ipdata.biz/shop/index.php?mai...roducts_id=263

Thank you.

[janjansssen]

Anybody? This is vital to my shop, so please help.