Quote:
Originally Posted by issybird
I think I have it now. Farther down in the configuration window there was a kepub permission that I unchecked and now the books are sideloading as epubs. Success! I can't replicate it now, nor on my Mini, so no doubt you'll be hearing from me when I want to undo it! 
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Which means you are using the extended driver. If you aren't going to use kepubs, then uninstall it.