Gift certificate - increases price instead of decreases it???

Someone has to help me here. I just tested my gift certficate function. But it appears that instead of decreasing the price, it is increasing it!!

Why would this happen?

Let me give an example:

Sub-Total: $39.95

00Flat Rate (Best Way): $5.

TAX 7.0%: $2.94SG

Gift Certificates: -$10.00

Total: $66.96

I am running Zen cart1.3.8a and have not done any modifications to the gift voucher component at all.

Many thanks if someone can help me out on this one - Im sure you will agree, my customers are not going to like this one bit..:shocking:

Anyone? I am in trouble - as I have gift vouchers that need to go out, and I guess I was wrong to just assume this would work. Even an indication of what files I may need to replace in order to get this up and running. If I know the file that fixes it then at least I can do some troubleshooting.

Check known bugs in 1.38(a)

http://www.zen-cart.com/forum/showthread.php?t=82619

See post #5

Thanks. Not sure if that link is the same thing, but i have found the solution under http://www.zen-cart.com/forum/showthread.php?p=635857. Gift voucher is now correctly replied.