I voted to close a question. Later, I was brought back to the question by a comment and noticed that it doesn't show any votes to close. So I clicked the link, only to see that it said I'd already voted to close the question.
Why would a question not show any votes to close if I'd already cast one?
(The question is here, but let's not meta-effect it, it's not in any way egregious or problematic. I'm just curious what happened.)