Itrosk

Hello, i was wondering if anyone could help me, i have just bought an m14x i have had it for about 2 weeks. the keyboard had too be replaced due to the number 5 key being defective, but now i am experiencing a problem with the back lit keyboard, on one of the purple color setting i notice that one of the arrow keys is a different color shade i only have this problem on that certian shade of purple and no other colors, is this a fixable problem? Any help would be very much appreciated.