What you're changing isn't "water discount". It's "water as % of oils". Some
soap recipe calculators actually have a "water discount" setting, which is separate from "water as % of oils", so it's best to not use one name when you mean the other.
That said, as AliOop explained, it's best to switch entirely away from using "water as % of oils" and "water discount". These settings are outmoded methods with some serious disadvantages.
Lye concentration or water:lye ratio are better choices to use when calculating the amount of water for a recipe. These two settings are different ways of saying exactly the same thing -- they just look different. Pick whichever one makes the most sense to you and stick with it. (You cannot easily convert these settings into "water as % of oils" or "water discount", in case you were wondering.)
If you want more background please see
Lye conc vs water:lye ratio | Soapy Stuff and
Water in soap | Soapy Stuff