This is the post that got upvoted, you'll see that it links to an answer marked "community wiki". I don't think this is the first time I've noticed it, but I haven't done research to show other examples. Is this a bug? I think it is. The StackOverflow FAQ says:
(Note that votes for any posts marked "community wiki" do not generate reputation.)
Edit: to be clear, I did see my reputation go up (and no other upvotes to connect with it), so it's not just an error in reporting on the "mail icon" page.
Edit again: I don't think the 16 hours thing is accurate. My answer has no revision history. The parent question was made community wiki on Dec 26.