My regular iPad mini does that too, my kid was playing with the stopwatch stuff for a while, and the milliseconds numbers were visible and flashing/changing after exiting the app. You could see flashing shadows of #'s on the home screen, even after recycling the power.
I've had this on PC LCD monitors too.
Usually if you just put up a blank white screen for a while it'll go away, I did that with the iPad and it worked.
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But certainty is an absurd one.
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