Hi there, the coupon codes that can be used are:
coupon10 (takes of £10)
coupon20 (takes off £20)
to reproduce the error - just add to cart any product that I have assigned £10 to. so the first 4 categories of products.
for my test I chose:
Individual Charms -> Large Daisy Charm
Decorative Charms - > Bubble Heart Charm
Bracelets -> Ball Bracelet
The grand total for the above is £30
I added a the coupon code (next to checkout button) : coupon10
if you then look at discounts its £20 (when its suppose to be £10 as the value of coupon10 is £10)
also if you keep adding more products the discount is then incremented by £10
also another test if you just begin with 1 item (£10) and trhen add a coupon code (coupon10) then checkout - it does NOT take any discount off.
Does this extra info help (sorry I should have been more detailed)