Copy tradint slippage 17% - is it real?

So I'm using a copy trading for crypto and today got a strange situation: master trader opened position with entry price 23 USDT, while my position opened with 27 USDT. And I can't check copy trading settings, cuz they are forced to follow the master. So does it mean that slippage is 17%+? Is it even ok? Cuz I obviously have lost money on this position