Bug reward SBD/SP

I wrote an article and 7 days later the payout:

$11,91 for the author

Normally what should I get with a 50/50 split?

For $11.91 we have $11.91 / 2 = $5.955

So :

The average value of the last 3.5 days for a SBD : 10$.
The average value of the last 3.5 days for a SP : $1,697

5,955$ of SBD or 0.5955 SBD (5,9551/10$)*
5,955$ of Steem Power or 3,508 SP (5.59551/1.697$)*

Theoretically, we get 0.5955 SBD - 3,508 SP for $11.91.

While on my wallet I have this:

5,955 SBD - 3,508 SP

5,955 SBD as if the price of the SBD was still at $1.00.

But it's more like that:

Current price

I receive a total of ($5,955 x 10 + 3,508 x 1,697) $65,505 instead of $11.91

Question:

Why is the SBD reward indexed on the $1 and not on the average value of the last 3.5 days as for SP?

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Posted on Utopian.io - Rewarding Open Source Contributors

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