my guild killed guldan the week before 7.2.5, we all got the cutting edge achievement and title.
bnet armory also shows title and achievement. wlogs does not list the achievement for me and lists the kill under 7.2.5
this only happened to me as far as i can tell, the rest of my guildmates have the guldan kill listed under 7.2, although they also have no ranking for that particular kill.
edit: actually found some guildmates that have the same problem on their personal page