There is a trailing space after "reputation score" in the title attribute for the reputation score: title="reputation score "
.
First noticed on Code Review, but it also happens here or SO. Probably on all SE sites.
If there was a minor-bug tag, I would've used this.
Edit: Also appearing here:
title="reputation score $score"
then replace$score
with actual rep if needed, otherwise blank. Fix will betitle="reputation score$score"
then add space before the actual score... anyway up to the devs to decide whether to fix it or not. :)