[SomewhatLikely]

I suppose it could be people checking multiple sources and coming back to downvote after assessing which is the right one. At least that's the world I want to live in. A guy can dream.

[hda2]

> people checking multiple sources and coming back to downvote after assessing which is the right one

I do this on stackoverflow. I wouldn't be surprised if this is what happened here as well.