It probably has something to do with not getting notified when someone replies to your post.
I bumped your comment up, if you want to find out I should be able to un-up it once you check your current number... if I remember to refresh my comment history ;).
HA that's exactly the main reason I keep an eye on it up top to know if I should check my comments to respond to someone. I'm at 1631 right now but also a couple other recent comments in the mix. Though also with that lately I've noticed more random downvotes for what I don't see any reason for.