First, you not new to POS right ?
We can't count exactly everyday you will have the same reward amount. POS is random, and a little bit luck.
If for example, your wallet running full annualy, you will exactly get 500 %. But since this only 3 days period, we can't count exactly you will get exact %.
If people got 12-15 coins by staking 200 coins, maybe they lucky and there is a little bug in POS diff retargeting, and dev already fixed, and will fork at block 12000.
But honestly i doubt people get that much, i'm staking 5k, only got 42 coins in 18 hours.
well, will see what happens next the
cause PoS on my altcom wallet working like clock, each date correct amount
as for Aerium the difference is just to much, that is why I decided to ask