When you send a book to a device, Calibre will only send one format. It will pick the one that is highest up the list of those ticked as supported in the driver for that device, If no compatible format exists it will first run a conversion to the highest listed format marked as supported.
The only way you should be ale to get extra formats on the device would be if you did the transfer using something other than the Calibre Send to Device feature.
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