Just a guess without seeing much detail.
damaged sheet before that one, black gets printed to the blanket, but not the cardboard that's folded up. Next sheet is fine, image prints to blanket maybe slightly off from the previous sheet because of the damage. Black prints to sheet, but the corner gets two impressions slightly off which makes the dot size of the halftone larger and that makes it appear darker.
If you look at the area you should see dots doubled a bit.
If not, then my guess is probably wrong. (It's a long shot, but if the dots got double inked in the same exact spot they could spread from overinking without appearing doubled. )
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