Is it luck when I accidentally upvote (and can't un-upvote) a HN story when simply trying to scroll down the page on iPad? I mean, I'm not saying all my upvote

Is it luck when I accidentally upvote (and can't un-upvote) a HN story when simply trying to scroll down the page on iPad? I mean, I'm not saying all my upvotes are haphazard, but there has to be a margin of 'accidental upvotes' to which the pattern could never be discerned anyway… I can't be the only one… ¬_¬