UPDATE Discrepancy about Steemit authors payout - Question - Need your help

Hey steemians, please help with your knowledge!

UPDATE: I found the answer to me question at @papa-pepper 's by chance. Yes I used the search function before asking this question but obviously used the wrong search phrase :-P
The clue is to do the 50/50 payout because steemit then calculates the SBD in the payout correctly, which is doesn't if you choose the 100% power up and get your payout only in SP!
https://steemit.com/steem-help/@papa-pepper/understanding-post-payouts-a-video-explanation-from-papa-pepper

I joined steemit a week ago and got my first payout (for my introduction post) yesterday. It seemed to match the amount that was promised with the potential payout. So that´s fine.
I´ve been very active since day one and kept posting and commenting :D

BUT today there was a payout for 2 other posting - and there is a huge discrepancy between the promised payout and the actual reward in my wallet. See for yourself

0.445SBD and 3.575SP seems very little to me, for a total of 8.26$ payout (without comments) .

On my introduction post it was 15.743SBD and 6.502SP for 31.39$ payout.

Any ideas?

I know it´s just peanuts .. and I´m not running around in circles because of that, I just observed and now I´m wondering :)