Okay thanks. Then it's KTExtended that's converting books into Kobo epubs when sending them to the device. I just noticed it again today, with some out of copyright free books from other sources.
And now that I go into the plugin's options, I see the kepub listed. Should have thought of that before.
This never happened before because I probably didn't have it installed on the computer I worked with until last week. Mystery solved.
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