Do you have the Orsinium DLC available to your account? (ESO Plus member, or have bought the DLC)
Usually you will only get told to go to Orsinium if you have an active ESO Plus membership or have bought the Orsinium DLC in order to be able to access that area, otherwise you're directed to Craglorn as everybody has access to that zone.
Yea, I've seen this too. It's just a cosmetic bug, since the actual turn-in spot is still Orsinium. The text here is just wrong in two places (says Cloud Mist instead of Lorkhan's Tears). And it only happens on the day when you get the Ravage potion writ; on the other days, it says the correct location.