@Lucabratsi Are you really driving a car with CCB rotors that may have Major Large Cracks, without being sure?
Have you at least removed the wheels and inspected the rotors yourself visually? What about your old ones, maybe they noticed cracks on them and labeled them as cracked on the other boxes as a courtesy. Not that those almost-new rotors should be cracked either. But it sure seems like 3 of 4 rotors somewhere are cracked, and you only have 8 with you.
Can you let us know or post some photos of the CCB and old ones. Maybe somebody here can visually identify what might be cracks for you.