Help Me Understand 'Potential Payout' - Why does it decrease?

Hi all. I'm slowly working my way through the white paper. But perhaps someone can help more quickly. I've created a few posts where the dollar figure in the footer ('potential payout' says the tooltip) grew as people voted, but then decreased sometimes quite significantly after the first payout moment. I'm trying to understand what's likely going on when that happens. Looking at steemd.com I couldn't find any record of flaggings or votes being removed from the post - a second question: would both those events show up there anyway?

Thanks in advance for any clarification you can give!

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