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It is related cover page structure. I solved it as I explain below:
Open the book in Calibre -> "Edit Book", choose cover or titlepage (depend the book) page, find the line defining the cover picture like:
<image width="1027" height="1499" xlink:href="cover.jpeg"/>
and add style="height:100%; text-align:center;" text after jpeg". It will be:
<image width="1027" height="1499" xlink:href="cover.jpeg" style="height:100%; text-align:center;"/>
Then save and close Edit Book. The new corrected book's cover will be seen in full size on your Kobo.
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