[DNSB]

Originally Posted by phossler

Thanks for checking

I figured it was an ADE issue

I took a quick look at your epub file and you might want to make a change in the code used for displaying the cover image. The current code is:

    <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" width="100%" height="100%" viewBox="0 0 306 423" preserveAspectRatio="none">
      <image width="306" height="423" xlink:href="../Images/cover.jpg"/>
    </svg>

I would recomment changing it to:

    <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" width="100%" height="100%" viewBox="0 0 306 423" preserveAspectRatio="xMidYMid meet">
      <image width="306" height="423" xlink:href="../Images/cover.jpg"/>
    </svg>

This change in preserveAspectRatio should improve how your cover image displays. Could you check the attached modification of your epub3 and let me know if this is an improvement.