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Since eInk is essentially a bistable technology (hence there are no power requirements to maintain the state), unless a pixel is overtly refreshed it is going to remain it the state it's in (either black or gray). If after a screen refresh all pixels are not completely aligned in their desired state they are going to show up as ghosting or dirty screen. It's a characteristic of any bistable system.
Bottom line, it's normal and nothing to worry about.
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