Mining LTC Issue

I mine LTC using 50pcs L3++ miners before, and then i added 20pcs L3+ miners . The issue is hashrate got increase but earnings decrease . Logicly when we add more miners, when the hashrate are increased and the earnings also will be increase . But my farm is not like this, please help me :sob::sob:

Possibly a recent difficulty increase? Also check your miners to see if the accepted/rejected share percentage is low on all of them (should be <1% these days). It’s possible you are overloading your internet connection a bit.