Yup. The same has been happening with me too. A post I made recently about DrugWars had a potential payout of somewhere around $7.36 as far as I can remember.
But now, after 7 days, the value shows an exact figure of $7.001. Where did the $0.359 go? Vanished in thin air?
It's really sad that you're powering down. I honestly wouldn't want you to leave the platform. Your contests were my first big push on Steemit and to see you thinking of leaving is truly sad.
I'd suggest you to stay, but I don't think I'll be able to convince you if you've made your mind. To whoever you wish to give your Steem, I hope they're worthy enough.
Lastly, if you really are leaving (which I still don't want you to), please make a last goodbye post. I'd love that.