Could someon please help me, I am mining XCZ with 6x1080ti ccmmier 2.2.2 cuda 9 and in miner it reports 18.6 mhs (3.100khs per card), but in miningpoolhub dashboard it reports 10-12mhs for the whole rig. What is the problem?
Your local hashrate is how many hashes your card is producing. Not all hashes are accepted and not all hashes are given equal weight on the pool. Of the accepted hashes the more difficult the hash the more it is worth so if you get lucky and find a number of difficult hashes that are accepted in short succession you can get higher than normal hashrate. Equally if you get unlucky and only find low difficulty hashes your hashrate will show lower than your local rate. On average though over time it should be close to what you have locally.
There is a large luck factor when it comes to mining that can significantly affect your reported hashrate at times both high and low.