AWO coupon pro order total is wrong

Hi, I'm using virtuemart 1.19 and AWO coupon pro is the latest version 1.4.8. When I order products and change the quantity in the basket, add my coupon code using Firefox or Chrome I don't get any errors in the basket.

But with Internet Explorer, if I add a product, change quantity, then add coupon code, I get the net total added to the original order total

eg

4 x item 1 = £20.00
discount coupon 10% = £2.00
Order total should be £18.00
plus postage £2.20

My order total in Internet Explorer is £38.00 plus postage

Any ideas?

Hi, when I login, I get an invalid token error, then once I use the coupon it's the wrong total.
This doesn't happen in either Firefox or Chrome so I'm really at a loss as to why this is happening

this is very strange. It works in ff and chrome but not ie? Is your cart processed through ajax or javascript? Otherwise, they should be processed the same. Maybe you can send a private message with details on how to reproduce the problem so I can see it for myself.