New Post: Incorrect calculation of total costs.

hi.
i use nb_store 02.03.08_Install_Rel4 and dnn 07.01.02.and i create 2 custom shipping method based on regions.also i apply 10% discount to my products. in check out page the total cost is incorrect.This is my picture.

my product price is 10000 IRR.
discount is 10% . therefore total cost after apply it ,is 9000.
i set shipping cost in this method to 19000.but it doesn't show correct amount. it add shipping cost to product price. 10000+19000=29000.
also The tax is not computed .
How do I correct this miscalculation?
Apologize.my english is not very well.
thanks