You know I have no idea why it happens, but I used to have the same problem. It drove me nuts, and you can see some of my pictures in my shop are dull with a grey hue, and that is so not what they are really like. Maybe it depends on certain colors? It happened a lot with light pinks. Anyway, It seems not to be an issue so much for me anymore, not sure why though. Fingers crossed it doesn't come back. You are definitely not the one!