Aura HD .kepub - I've Done Something Wrong

For the life of me I can't figure out what I've done wrong! Earlier, I was having no problem with all of my sideloaded epubs showing up as .kepubs after transferring the books to my Aura HD with Calibre. But I've somehow tweaked the Kobo plugin such that now all of my books are only showing up as regular .epubs after transfer with Calibre.

Can someone point me in the right direction back to .kepubs?

:thanks:

ETA: I'm using Calibre 0.9.28, with the latest Kobo Touch plugin enabled.