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Some folks are more sensitive to ghosting than others, within the same model different devices have been reported as having different ghosting levels to say nothing of different models. I wouldn't call this a bug, at least not one that can be fixed. Kobo could force two or three refreshes upon wake, but then you'd get more people complaining about the flashing and the time it took to wake. As it is now, tapping on the screen to bring up controls and then tapping again to dismiss them should trigger a refresh and with that clear the ghosting.
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