Guild House does not appear to be instanced

when visiting the guild house, there will be horde bots camping periodically, killing my npc's and all the fun that comes with that. While I find this occasional interruption a fun level of immersion in a barely populated server, I also wonder if this behavior is expected. Also, when I created a new batch of toons with a new guild, bought their guild, teleported, npc's are already there.