Currently, there are two "upvote this if your position is X" posts, each with a corresponding Karma balance. Traditionally there need be only one karma balance, but the poll was set up by two different people. If somebody upvotes my poll comment, they should downvote my karma balance. If somebody upvotes your poll comment, they should downvote your karma balance.

I posted the 'Psst.' comment when the parent/child got unequal absolute karma counts because I didn't know how that would happen.

That was right. This shouldn't ever happen in polls, but it frequently does anyway.