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I occasionally up-vote old comments.

It works like this: I'll read a comment that I find really intriguing for some reason (love or hate, usually). Curious about the poster, I'll go to their "about" page and scan through their old comments, which I'll upvote using the same criteria as for new posts.

Probably once a month or so, I end up giving 3-4 upvotes to one person this way.

And http://news.ycombinator.com/item?id=2158116 probably made this effect stronger for a couple of days.

If someone re-posts a submission you made (same URL), your original is upvoted by 1 instead of posting a duplicate.

Some old HN threads are linked in more recent threads or on blogs/websites. That could explain it.

I've seen this a bit, and tracked most of it to an old comment in a post asking for what features you'd like to see added to HN thread.

Ask HN: Karma Creep?