I'm trying to think of how that would happen.
The closest I can get is maybe overinking along with too much water on the plate.
There's a similar common problem on an engraved stamp, but it was because of a change in both the pigment and the type of press all at once, and was from almost 40 years earlier. By the time T207s were a thing it had totally been sorted out and as far as I know wasn't ever a problem on lithographed items.
The idea that the glosscoat has been affected a lot might work too. If the gloss was printed on top of a still damp (ish) black, they might have combined and drifted as the gloss was affected, or the black slightly migrated into the gloss.
Overall a very strange outlier.
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