the pow mining difficulty is very low, the pool is likely just getting adjusted to the massive amount of hashpower getting thrown at it. i wouldn't be surprised to see a decent amount of orphans until things stabilize.
Thats exactly what is going on. Big rigs mining low diff and causing rejected shares. I am mining myself and getting the same results. I see a lot of rejected shares on the back end. Should smooth out as the diff rises.
Perhaps this coin needs better pool?
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