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Fading or inking fault, upper left.
Those light ink breaks are very common on used eagles IMO, less so on mint stamps.
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Some type of stain, lower right.
I attributed the (very) slight difference in color to lighting/scanning aberration rather than toning. If I'm wrong, it's so slight that the vast majority of collectors would not consider that a major fault IMO.
Bottom line is I would be happy with such a "binned" stamp all day long and if you are throwing stamps of this calibre in the trash bin, I think you're doing the hobby a disservice. *shrug*