When you vote the potential payout is being recalculated. If one or more people who voted before you, voted on more articles in the meanwhile their voting power might have come down. In that case the potential reward for the post you are voting for goes down too.
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Wrong. Once you vote the voting power for that vote is fixed and does not vary when you vote on other things it is the power of your next vote that changes not your PREVIOUS votes. That would make absolutely no sense.
It is the VALUE of the vote (not power) that varies based on the price of STEEM and the total votes cast that day (since the amount of Steem to be distributed is fixed and the number of votes are not).