It's probably because of the sun bleaching the paint. After time the paint will lose the pigment, happens most with red colours and white, and especially on plastics. if you have a sunroof you might notice it there as well.
My brothers car that is green has a different shade on the sunroof, and my sisters car has faded on the plastic parts, the bumpers and wing mirrors. polish should help slow it down, and a cutting compound could bring some colour back.
Pete.
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