I think MN stats on
https://masternodes.online/currencies/QRK incorrect , even with several masternodes... I can't achieve similar profit per day.
$3.4629
0.00032787 BTC
348.7986 QRK
Are we all using same wallet or not.... why some get more Rewards or some get very less rewards

me too!! Suspicion that the developer has done something!!
Before the update everything was unstable and the blockchain stopped its activity twice on the weekend, but at least the yield was exciting.
Now everything is stable, but MN yields are far below the pure stake yields of other coins. And you are not even able to buy or sell QRK, because this function is frozen at all Exchanges.
In addition, the distribution of the rewards on the MN is not comprehensible and unfortunately the developers are silent again.
Surprisingly, there are more and more master nodes and there is still an amazing trade taking place on QBTC, although deposit and withdraw have been frozen for many days.
Somehow the QRK contradicts any logic.
Since you can't sell your coins at the moment, you are obliged to hold them and can only hope that you can generate a return with MN, which you might be able to pay out at some point. Perhaps is this the plan behind all.