"Enhanced" potions are only shown in their (3) variant[edit source]
Some potions require an already made potion to create a new one. One example is Sanfew's Serum. According to the calculator you're losing money making these, but only because it suggests using the super restore(3), even though it works with the super restore(4) as well. This doesn't only show the wrong profits, but also the wrong amount of potions required, as the xp are given by doses used.
Potions I've found and tried to work this way: Sanfew's Guthix Balance
But I'm pretty sure there are more. These are just the ones I personally tested.
I hope this helps fixing some little errors