Herbalists

So my herbalist just died this morning at rollover from old age, and I just set a new herbalist, yet I don't have all the recipes learned then I did before (I had had all 21 recipes learned, and now i only have 15 learned)?!😠 why is that?

You have to relearn some recipes every time you swap herbalist. It's how the mechanic is supposed to work ^^ You can relearn them all in the Research Medicines section :)