As of last block:              0.061xxxxx BTC   
Estimated Change:    +0.0087xxxx BTC   
Estimated Total:              0.070xxxxx BTC   
      
         Hashrate Average      Weighted Shares
12 hours   3,516.35 Gh/s          35368448
3 hours   3,728.03 Gh/s           9416704

Can someone please explain this?
I have been maintaining my hashrate average always @ 3.5 to 3.7, but in the last 2-3 days I noticed my estimated change drops like a bad habit.
In the last 9 blocks pool received; with maintaining the hasrate average of 3.5 to 3.7, my estimated total is only 0.070xxxx!
Also in the last payout, I was supposed to receive ~0.30xxxx BTC, but only 0.26xxxx BTC was received, which is not much concern.
What is concern me is, if the pool is punishing me for whatever the case might be!  It seems like my estimated changes is the same as PPLNS or less these days!