did you actually re-send the book from calibre library to the kobo device, after editing it ?
what you typed suggests you went directly from close in calibre to open in kobo ? "I closed Calibre, the system said "unsaved changes". So I had it saved. I opened the book on the Kobo..."
I would suggest completely removing the book from the device, then reboot the device, then re-connect it to calibre, then re-send it...
I don't think you can directly edit the "on device" copy .
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