cardia payment module fails with Group Pricing

I hawe a Cardia module from http://cardia.omnimedia.no/. In this original version there it is a problem with the communication to the Cardia payment gateway. Cardia fixed this for me, check attached file. Now the module allmost work.

If I make a buy for a product (kr 45), flat rate (kr 15) and Tax (kr 12) = total kr 60,-
When i confirme this and the Cardia module relays me to the payment gateway th total = 57,- ???

It also fails if I am a member of a group pricing discount group

If I make a buy for a sum over kr 300,- that give me free shipping the sum after the module relayes me to the payment gateway is exactly right.

We have tested with the 2 CheckOut module. The 2CO module does it right, what is so wrong with the Cardia module. Please help, I realy need this module up and running yesterday! :)

Regards
Cakemaker