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Sometimes older eBooks have thumbnail images of the cover and maybe these do and the cover being read as the thumbnail.
If you are using Calibre and you are side loading, have a look at what the cover looks like that Calibre has. Select the eBook and press e to get to the Edit metadata requester. Also, go to the Plugins preferences and find the KoboTouch drier and configure it to upload covers. I have black & white covers on.
Also, if any of those books are in Calibre with the correct size cover, you can use the Kobo Utilities plugin to send the cover to your Kobo.
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