then somebody already claimed leadership
Must be important member, and have fellow faction members positively modify reputation of yourself.
i had a weird thing happen to me to when i tryed to claim leader ship it said nothing about claiming leadership in misc but then i lowerd everyones rep as much as i could and went there and it was there maybe that will help maybes it a bug who knows.
Claim leadership, then logout terminal, log back and Miscellanous -> Confirm leadership