And by someone, I mean that evil feline WesleyDavid:
That screenshot was taken just before 4pm PST, i.e. just before 0000 UTC. That shows KittehHead's votes for the month, which is the same as for the day since it's March 1st. Just to be sure it wasn't that SE had the time wrong, I tried upvoting something and got the expected "Daily Vote Limit Reached, Please Vote Again in 6 minutes."
So how did Kitteh^H^H^H^H^H^HWesley get 42 votes in one day?
ADDED: It's getting worse... Now it's March 2nd, and Wesley/Cat has 3 extra votes:
Now I finally got an extra vote (take that evil kitteh!), but it hasn't helped me understand why: