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The book may be adding a top/bottom margin or padding to the cover. If so there are two ways to fix it:
The easy way: Use Calibre to add the book to the device, but first configure the KoboTouch driver so that the "upload covers for books" box is ticked. (You may also want to tick the "keep cover aspect ratio" and "upload black and white covers" boxes while you are at it.) This will usually give the best results as it sends the image that you see in Calibre, rather than generating an image from the first page of the book.
The other way: Edit the book using Calibre's Tweak Book function or some other method, and remove the top/bottom margin/padding. It is hard to explain exactly how to do this as there are a million different ways to code the cover image for an epub and each publisher seems to use a different method.
Also, some people find that it is necessary to power off their reader after changing covers to get the new cover to show up. I haven't found that necessary with recent firmware, but it is something to try if things don't seem to work as expected.
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