I've noticed this many times before, just never let it get to me till now. So if I'm trying to brew a potion of Fortify Health using Blue Mountain Flower and Hanging Moss as the two ingredients, the game will show (and deliver) a poison of Damage Magicka Regen instead. I know that the two ingredients I'm using have both of those properties, but I have Fortify Health selected on the menu to the left (SkyUI).
Is it always going to do this, or am I missing a way to choose which product you get when your ingredients have more than one outcome?
Screenshot of what I'm talking about lol