I have set up a number of discounts of my account to give a set amount off specific products.
When doing this I gave each one 6 different codes that could be used and this then generated 6 individual discounts for each item.
BUT when I test it on my site it's applying each one twice giving people double the discount they should be getting. Each one can then be removed individually.
For example if they're buying an item and using the code 'newsletter' which should give them £2 off when they add it to my cart and update it shows it as being applied twice and they get £4 off instead. I can remove either of them and then the discount drops down to £2 instead.
This seems to happen to all the 98 items I have added the discounts to and using any of the 6 discount codes for them.