Thanks for playing, and really great to hear you liked it!
The brewing should work so that all effects that the ingredients have in common and are not "opposites" (such as poison and healing) will appear in the potion as main effects (=effects that increase the value) and in addition if the ingredients contain any negative effects they might also appear as side effects (=effects that lessen the value). If this doesn't end up happening it's probably bugged :D. The whole thing ended up becoming a bit more complicated than I initially thought, and communicating the mechanism to the player became a bit too hard for me, I think I need to do something about that in the near future. Maybe I have to tweak the whole algorithm to be a bit more comprehensible.
Gotta do something about the storage bug, sound super annoying. Thanks for reporting!