[paperless7]

I'm having issues with sideloading certain epubs to the Kobo Libra Colour (books that otherwise work fine on my previous Kindle).

I'm trying to load "The Dark Forest" and if I use Calibre to sideload it on my Kindle Paperwhite it works just fine. However, using KoboTouchExtended (even tried just KoboTouch) I get a .epub.kepub file that behaves strangely.

By that I mean that it goes to a certain page of the book no matter what page I was in before exiting the book. It's something that happens every time I switch books. It only happens with one of my books so far. Although this is a new device so I have not read many of my books to confirm whether or not this is common.

Also, the UI menus to skip chapters and to seek a page are just very clunky and glitchy (just for this book).

Things I've tried:

1. I re-downloaded the book and I can confirm that thousands of other users have downloaded the same copy. So the file itself should be free of corruption I would imagine.

2. I used the "Quality Check" plugin and made some namespace, container, etc. checks but it found nothing wrong with it. However, I didn't make ALL checks since the plugin has like 50 options to choose from. I which there was a "check everything" option in the plugin. If anyone has any advice as to what to check let me know.

3. I loaded the .epub manually to my Kobo without using Calibre and it works just fine so the issue is either Calibre or the conversion to .kepub using KoboTouchExtended.

Problematic file in question:
[snip of copyright file link]