Alchemy experiments applying multiple instances of the same status effect instead of stacking duration.

[cat]

Have seen this happen with Blur, Twitchy and Minor Poison.
Rather than a new experiment adding duration to a stacking status effect already on the character, a separate status effect is applied.
It appears this is not just a UI issue as the mechanical benefit/penalty is duplicated:

Character has Melee Combat and should have 45% to hit. Twitchy brings it down 5%, Drunk another 5%. On character sheet Melee is 30% with two Twitchy debuffs appearing to give a combined -10% to hit.

[Nayru]

this is how it's always worked, whether or not that was intentional is long since beyond me

think poisons don't stack though even if have clone statuses