I don't know why your comment is being down voted. Thank you, that's a kind comment. But this happens on almost every comment I leave: I get downvoted once or

I don't know why your comment is being down voted. Thank you, that's a kind comment. But this happens on almost every comment I leave: I get downvoted once or twice and then the comment slowly gets upvoted. I think I have a troll (or even a script) that downvotes new comments I make to HN. Sad.