Prohashing hash rate not matching what HiveOS reports?

I'm using Prohashing to mine ETH and get paid in ETH. HiveOS reports my hash rate on all card correctly, but the dashboard in Prohashing is reporting about 1/3 less. Does anyone have any insight as to what's going on and/or how I can fix this? I know that ideally I should be mining on the RVN network, but I can get more RVN this way (if it works correctly)