1 led : blue color displayed instead of red for odd color values

[Lahorde]

I'm getting a blue color for odd values when running this test on a single neopixel. I'm working with an rpi B+

  int j = 0;
  numLEDs = 1;
  setBrightness(1);

  while(1){
    setPixelColorT(0, Color(j++,  0,   0));
    show();
    sleep(2);
    printf("%d\n", j);
  }