I always tend to hit my maximum vote cap of 40 every day. They are not spam votes, but actual votes for good questions and answers as I tend to spend a good part of my day on the site.

Now, as one can see, I have hit 36 votes, and seeing that the normal cap is 40, I should still have 4 more votes, but when I try to vote, it says I have reached the maximum number of votes for the day.

Why do I not have 4 more votes left?