I bought one of these from Centerfire systems in Versailles Ky. my first one was immaculate, and shot perfectly centered without any sight adjustments whatsoever. decided to get another one. Same thing as yours. plus> very odd recoil for an AK a violent recoil unlike any other AK i had ever fired. Also, about a foot and a half to the left at only 50 yards. adjusted sight all the way to the left and it still was barely on target. also about half the rounds were Key holeing... took it back and they gave me another one, still need to fire it for zero, but the guy said mine was the first complaint about the Polish AK...
He was going to send it back to Century for evaluation. other than my Valmet 62/s these polish AK are my favorites, "other than the bad one I got, hopefully the new one will work better"