It is normal, Glo HD has more ghosting than the PW2 I own. As fas as I know is because Kindle uses Regal waveform to drive the carta display, while Kobo doesn't.
On my Kobo HD is quite annoying when opening a book (book cover ghosting), with menus, and when using dictionaries.
I also found that ghosting was less heavy on firmware 3.18.0, but ghosting went back on next release.
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