Was it on a server?
Ohh yeah its my private server 1/25 online only me :P my brother is to join me later but he doesnt have the ip yet.
sorry if im not logged into the forum
Was probably a conquest. They cause fangorn mobs to spawn in Rohan (in fact, they even spawn in Mirkwood)
Not a bug. When players pledged to Fangorn gain conquest points here, ents and huorns can spawn in Rohan. Same for players who pledged to Fangorn allies Lothlorien or Woodland Realm as neither galadhrim nor wood-elves are set to spawn upon conquest but their Fangorn allies are.