If you keep your browser open and someone takes a village it will appear not changed until you hit refresh, this has lead to me attacking tribe mates in the past.
if a ally take a barb and you farm there regularly, it will still appear like a barb until you refresh, if this isn't a bug then i don't know what is one. its not a fatal bug or problem, just thought i would bring it to the devs attention if it wasn't already, if you say its not a bug then 'okay' its not a bug ;P