I'm Stuck HELP !!!

Here goes.... PLEASE READ.

I'm still using v1.3.7 because I need to use barclays epdq module.

My issue is that when someone orders a product I get an extra amount added after Step 3 of 3 - Order Confirmation page. So for example,

Sub-Total:£145.00
Courier (UK):£15.00 (ZONE TABLES)
VAT:£28.01
Total:£188.01 (Think I have an extra penny on here for somereason but might be wrong.)

Anyway my issue is when I click confirm the order.
I go off to the barclays epdq page taking a total of £190.64

If I go to my orders page I see,

ID Payment Shipping Customers Order Total Date Purchased Status Action
98 GV/DC poszonetable Tim Wright £190.64 07/24/2008 16:36:17 Pending
98 GV/DC poszonetable Tim Wright £188.01 07/24/2008 16:36:17 Pending

so I have a duplicate entry for id 98

and if I then go into the invoice I then get

Sub-Total: £145.00
Sub-Total: £145.00
Courier (UK): £15.00
Courier (UK): £15.00
VAT: £28.01
VAT: £30.64
Total: £188.01
Total: £190.64

So the order twice, I have worked out that the difference between the 190.64 and the 188.01 is the VAT on the delivery being added twice??

I'm stuck please HELP someone!!

Thanks,
Tim Wright

Do you have your currency set as the default in Admin/Localization/Currencies,
with a Value of 1.00000000??

Thanks for the reply. Yes it's set as default and set to 1.00000000