Discount Master ‑ Quantity

This is the second time I have set up a sale on this app. Once again it was easy to set up but once again the app failed. The first time it did not return all prices to normal. This time it has not discounted all the products. This makes me look very bad to my customers :-( Support was very quick last time and I hope it is this time - otherwise my widely advertised sale will be a big fail!