I've noticed my skies go a teensy bit wonky on occasion....slightly red looking, I think it's sometimes when PPing jpegs is when it happens...but not ALL the time....could be a tie up with contrast and sharpening....someone around here might be able to elaborate a bit more on it.
But hey, no matter, nice bird of prey shot, I'm up for some decent bird shots anytime, birds are interesting they are always doing something, hunting, pecking at seeds flowers or insects, nesting, claiming territory, whistling, chirping...
Greg