Sometimes that ghosting happens to me with my 505. the only thing i can think of is that when i press the button to shutdown the e-ink screen doesn't get a complete shutdown signal (if thats even possible) or it just gets interrupted in the middle of the clear signal.
It always clears once i turn it back on and is never there when i do a full power down rather than a stand by.
It doesn;t bother or worry me at all and i wouldn;t let it bother you.
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