The left rear rotor on my 2021 Sierra 1500 has shown scoring from the first week of purchase. I took it back to the dealer and was told it was normal wear after 2,200 miles. It has only gotten worse since then. The photo was taken at 2700 miles. None of the other rotors show this wear. It appears to me that the pad is not seating properly against the rotor and picking up debris. Any experiences or input would be greatly appreciated.