Ghosting has me stumped

the feed rollers pinch the sheet to push it into the infeed cylinder grippers they release about 3 to 5 inches down the sheet depending on how tight the buckle is set. if ink is transferring to the top roller and offsetting back onto the sheet it would transfer to the blanket also from the sheet itself. since you are running only black on the second pass the blue images must come from the sheet. If there was any kind of sensitizing of the plate the black ink on the rollers would make the ghost images black.

I'm going with the old guys theory
 

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