Unfortunately, the App Store does not have the concept of a “sale” (just a price change). As a result, when I change the price, Nitro get a new price, but it doesn’t know what the old price was (and each country has its own price that is specified by Apple). Anyway, I will figure out a way to put better messaging into the pricing screen for Nitro so it’s easier to understand the sale prices. Sorry for the confusing experience.