Coupon Discount % Calculates Wrong!

HI,

A coupon has been set up to give 10% discount on a product category. However, it is giving £10 off the order, not 10%. If I change the discount to 5% it gives £5 ??

A test order of 49.99 was done, and the 10% coupon applied, this should have given 4.99 discount. But it gives £10?

An urgent response would be greatly appreciated this is causing delays in a customer promotion.

Screen of the coupon settings attached.

The site has no TAX as the client is not VAT registered, so all prices are inclusive so it cant be an issue there.

Thanks

I have updated the clients component and all seems to be fine now.