Hello I have a similar issue. I'm a new October user
With the Clear theme, I've uploaded an image to the library and put it in a folder, then inserted it, but the theme uses a relative path URL for it, while for theme's resources it uses an exact path.
It happen for the header's logo and for the header image block.
<div class="header-image jarallax" style="background-image: url(/storage/app/media/mythemeduplicate/mylogo.png);">
<section id="page-header" class="jarallax" style="background-image: url(https://domain.com/october/themes/myfolder/assets/images/img/1920x500.png);">