Error : Gift Vouchers/Discount Coupons and paypal

[pongsak]

Dear all,
I have error(see in attach file). I use Gift Vouchers/Discount Coupons.

Sub-Total: £26.96
Individual Shipping (Flat Shipping Rate): £19.48
Discount Coupons:4REAL: -£6.97
Total: £39.47

And click "Confirm Order" goto paypal website.
I see error Total with Postage:£46.44 not £39.47 .

How to fix this.

I used oscmax 2.0.

Thanks all.

Pongsak From thailand.

[pongsak]

Help me please..