Hi,
I don't know if that really a bug or a feature or mentioned earlier (haven't found something like this), but in the Human Trade Camps in some Towns like Morning Light, Harro, Dikaina and some more has some Trainers that can't be activated. When I wanted to activate them, it says "The location of the child NPC you want to put is not within the parent strutur's ouline" (the typos in both last words of that sentence is from the ingame message I got when I tried to activate the trainers )
Greetings,
MurphyFox
PS: Ooops, sorry, forgot to mention that I mean it's on the the Unity Shard, don't know if there is the same problems on the other servers ...