Potential Payout ?

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Hi guys i got some questions about potential payout
When some whale vote me i get potential payout like 4.60$
And after few hours why it goes down to 4.48$

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I had one case i posted something and whale voted me and potential payout was like 8$ at first then after 7 days it got up to 17.25$

Can someone explain me how potential payout work

Potential Payout ? | Ecency