There is a certain probability to mine a block, sometimes faster sometimes slower. The lucky rate fluctuates around the theoretical value (100%). When the lucky rate is higher, earnings will be higher too, which only affects those selecting PPLNS and PPS+.
If there is any problem, please contact with operation staffs:
1 ) Telegram : Juliana Mei (English&Chinese )
2 ) Telegram : Jinglong Cui (Chinese & Korean )
Thanks for your support!
Happy mining in BTC.com!