After random checking I noticed my faction is suddenly at war with someone.
I did not declare war on someone, and the faction records show the coleader did not declare on anyone too.
I have no events that that particular faction have ever declared on us, nor there are any records in faction news.
Recently we were at war with a couple of factions, but the wars ended.
except that mysterious one.
http://i.imgur.com/3xuZX01.png
Admins can check my events and my faction logs, so I won't be posting that in public.