Hello guys, I bought some Greencoins on coinexhange few days ago. Now the greencoin is $0.002219 and so i make a profit. But on coinexchange if I sell it I lost money. Could someone explain me why ?

Actually on coimarketcap : 1 GRE = 0.000 000 54  BTC
           
Actually on coinexchange : 1 GRE = 0.000 000 05 BTC

I don't understand