I am guessing you are new to pool mining, but anyway this is because the miner program calculates hashrate at 100% luck but in reality this can fluctuate I have had times were the pools say they are mining 200% faster than what they really are and other times were they only show 50% but over 2-3 days it averages out to be pretty close to accurate.
No, that isn't what is going on.
I had three rigs trying to mine lyra2v2 100% of the time.
A does 420 MH/s, B does 210 MH/s, C does 60 MH/s.
According to zpool A does 380ish, B does 75 MH/s and C does 40 MH/s.
I have verified that every single rig mines at the expected hash rate for ZEC and Ethereum on Nanopool. I even went out and did a complete rework of my network. There was no difference as far as mining goes, though I went from 70 ms ping to 20 ms ping and 2 Mbits up/down to 100 Mbits up/down.
Must be a problem with ZPool, right? I switched rig B to miningpoolhub and it was not any better. So it doesn't really seem to be a problem with ZPool. Why does A almost work, while B and C are garbage? And this was over a period of two days. I have since moved over to mining ZEC on nanapool and they have been rock solid. I still have rig A on zpool since it was making very good money.
Perhaps something is just odd with lyra2v2? I have been thinking about joining a straight monacoin mining pool to see if there is a difference.
Of course, I haven't been able to connect to zpool lyra2v2 server for over 2 hours now... Now all my 1080Tis are mining ZEC on nanopool. Though I would love to switch them back.
