I saw a similar post that was made a few months ago: Can't complete healing potion quest
In short, despite having upgraded all the potions, the quest will not clear and is simply stuck in the queue waiting to be completed. There’s no check on the quest to see if you’ve already done the requirements, you’re just expected to do the task asked of you… even though you cannot reset the potion upgrades to be able to upgrade the potion.
How are people supposed to complete this quest if they’ve already upgraded their potions? Can a dev manually clear the quest?