After upgrading town center to lvl 2, I get notification that enemy is sighted but when clicking it targets wolf den and there are no enemies.
Happened to me too.
The den is considered like a bunch of enemies.
At some point it may prove useful to bring your military to get rid of it … or let it live peacefully if you have no villagers going nearby.
This is not a bug. That warning appears to inform you of a wolf den, which can prove rather dangerous. 
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