Sub total error

[parma]

Hello,

 

I have noticed that my subtotal amount is not correct.

 

Instead of showing the amount excluding VAT im getting another figure which I cannot work out. I have replaced the order total module files with the original oscommerce files however, still no luck with the correct figures.

 

This is an example

 

The subtotal in this case should be ?23.56, and after adding the VAT and delivery the total is ?33.50 which is correct.

 

Sub-Total: ?5.89

VAT 17.5%: ?4.12

Standard Delivery: ?5.82

Total: ?33.50

 

Has anything experienced anything like this? or know a possible fix?

 

Thanks in advance,

 

Parma