Is claymore cheating with displaying hashrate?

I have rx580 which claymore's reported hashrate is 28.2
the speed must mine about 0.008135 ETH/24h

On dwarfpool the actual income in 24h is about 0.00635242

I do ETH only mining with devfee on? the pool takes 1% fee
so 2% is total fee

28.2 * 2% = 0,564
and pure profit speed is 28.2 - 0,564 = 27,636 which should give us 0.007962

0.007962-0.00635242 = 0.001610

0.00635242 - the sum of ETH should be mines with speed 22 M/h

So where's another 5,6 M/h gone?  (27,636-22=5,636)

Or it's just claymore cheating the real mining speed, 22 instead of 27,6!!!

 

http://i95.fastpic.ru/big/2017/0808/1c/d5d78bc48519c8fff599cf70140f241c.jpg
http://i95.fastpic.ru/big/2017/0808/cc/4d9c105718945ed75300318f7834bacc.jpg