[MSWallack]

I use Calibre to manage my books and send them to my Kobo Sage via USB. Several of the books that I've sent to the Kobo show tiny cover thumbnails (or, perhaps, half the size of the thumbnails for most books). I've checked in Calibre and the covers for those books appear to be the same size and resolution as the covers that display correctly. I've tried deleting the covers and then downloading them again from the web before replacing the book on the Kobo but that hasn't helped. Any thoughts as to what else I might look for to try to track down the issue?