In my SE network profile, I see 117 score for my top voted question. But if you visit the question, you'll find that it has 118 score. The last vote I got on that question was at least a week ago, IIRC. Bug?
Caching should be blamed. After I voted on the question, the stats updated. I guess the stats updating is triggered by a vote on the post, which fails sometimes for unknown reasons.
I guess a developer should check why the updating could fail, and if it is a broader problem.