Titles taken/lost and offline players?

I've been seeing strange behavior since the beginning of May on two different servers with leaderboard/title changes . The chat broadcast somewhat frequently says that a player has taken a title but the stats do not agree, and it's not usually even close between the 1st and the 2nd place player who supposedly gained the title, where I might expect to see an incorrect cached result for a short time. I haven't been able to reproduce it consistently but there does seem to be an issue if the leader in a category has been offline for a couple of days -- then it's almost as if that player's stats are ignored, even though they're still listed on the leaderboard. When they log back in and do an activity that relates to the title, they regain it. But I've also seen it with two players who are online at the same time. Not easy to explain because it's inconsistent other than the title changes should not be happening. Any idea what might cause something like this?