Yes, the Kobo devices use the first page of the book as the cover image. The first time a cover image is needed, the device renders the first page. Strictly, there isn't a way to change this. Personally, I just add the cover to the start of the book. The simplest way to do this is using the Polish books.
But, you can configure the driver to send the cover with the book to the device. With this, calibre will send whatever cover is in the library to the device with the book. For books already on the device, you can use my Kobo Utilities plugin to send just the covers.
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