I looked again into your post history and into the The Voting/Experience System.

You have almost no posts newer than 4 weeks and the Rep-to-XP ratio is 1/3 for such older nodes.

Hence a +92 XP requires 1 upvote on 276 older nodes. °

So if someone tried to improve his XP by continuously up-voting all your >5000 old nodes, this effect could happen. And you would hardly detect this because your node reps only increased by 1.

This might be motivated by the fact that there are not enough new nodes for upvoting. Some fellow monks are famous for having a high XP to (own) post ratio, while their own posts have only average reputation. That's most likely gained by their own continuous voting.²

> or that there's a bug.

there is always a bug ... ;-)

°) for instance, I have 48 votes left every day. Spending most of them during 6 days on 276 of your old nodes, would give me a 25% gain, hence about +78 XP for me while you gain +92 XP.

update

²) I won't do the Carlson-Niemann now to point fingers ... But guys plz keep in mind that automated votes are against the rules! :)