Could be one of 2 things: 1° you got the wrong order of the potion, so just need to click on the trash can and start a new potion again.
Or some technical issue, I still trying to figure out why they don't perform some times, but other times no problem.. I usually get this when I go too fast.
Also someone told me that because of the browser some features didn't work.. so maybe try on a different one?
Usually the problem that I got a few times where I was totally stuck, solved it self when after 30 seg the next client comes.
Anyway thanks for trying the game ❤️