When I go to checkout it correctly show the correct shipping price for 100 the order tahty I have setup in workflow_ng. But when I goto the Review order then it show 200 for the shipping amount. The shipping price is set to zero for the product.

If I set the shipping price to 100 for the product then the Review Order screen give me 300. Very strange. How is the value is calculated?

Any ideas whats going on?