Not possible to do a partial refund on valid bids. Your post received a @pushup for the full 0.4 SBD bid.

But how can 0.4 = 0.89 it doesn't existe 😑

Steemit website counts SBD as if it was worth $1, but in fact it is currently worth ~$7.50.
Most of the rewards (currently about 85%) are paid out in SBD, so your reward will be worth more than what steemit site shows.
Let me know how much your reward was after post payout.

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