Is getting 10% rejected shares normal on the multipool? 
Miner sometimes says rejected share because difficulty too low, even though the difficulty was high enough (example 515/512)
Miner sometimes says rejected share because difficulty too low, even though the difficulty was high enough (example 515/512)
Most people observe a reject rate of 4 - 7 %. Where is your rig located? If the pool continues to be that successful the developers plan to install an EU node.