Hi

I am having a few  problems with "BUY 2 GET 1 FREE" offers.

1. Certain items, you are giving a discount of £1.92 for each item that costs £1.90, and I have had others where you have given a discount worth more than the original cost ( on multi items of the same price)

2. sometimes you are  allowing two free if they purchase 6, which is what I would expect, but on other items I am having to manually refund when I notice.

Should it make a difference if the buyers mix and match from different listings, as I was assuming that this was the point of the offer?