I didn’t use right terminology (WP uses relative URL, but it isn’t real relative URL). So, I’m correcting myself:
https://www.example.com/test/example/example1
It’s absolute URL and /test/example/example1 is absolute path. Relative URL can’t start with slash. Sorry for confusing, I saw that you have code or plugin which change URLs from absolute URLs to absolute paths (it removes https://www.eaxmple.com from all URLs). I’m checking all details now.
eg. https://www.digitaldocrepair.com/5-epic-cell-phone-disasters/
<ul role="menu" class=" dropdown-menu">
<li class="menu-item menu-item-type-taxonomy menu-item-object-category menu-item-3116"><a title="Corporate News" href="/category/corporate-news/">Corporate News</a></li>
<li class="menu-item menu-item-type-taxonomy menu-item-object-category menu-item-4126"><a title="Franchising" href="/category/franchising/">Franchising</a></li>
<li class="menu-item menu-item-type-taxonomy menu-item-object-category menu-item-3117"><a title="Industry News" href="/category/industry-news/">Industry News</a></li>
<li class="menu-item menu-item-type-taxonomy menu-item-object-category menu-item-3118"><a title="Technology Hacks" href="/category/technology-hack/">Technology Hacks</a></li>
<li class="menu-item menu-item-type-taxonomy menu-item-object-category current-post-ancestor current-menu-parent current-post-parent menu-item-3119"><a title="Technology Humor" href="/category/technology-humor/">Technology Humor</a></li>
<li class="menu-item menu-item-type-taxonomy menu-item-object-category menu-item-3120"><a title="Technology News" href="/category/technology-news/">Technology News</a></li>
<li class="menu-item menu-item-type-taxonomy menu-item-object-category menu-item-4127"><a title="Technology Reviews" href="/category/technology-reviews/">Technology Reviews</a></li>
<li class="menu-item menu-item-type-taxonomy menu-item-object-category menu-item-3121"><a title="Technology Tips" href="/category/technology-tips/">Technology Tips</a></li>
</ul>
Category URLs aren’t absolute URL, they are absolute paths (if you open category sitemap, you will see same). So, filter term_link exists (I’m guessing that filter uses standard WP function):
add_filter( 'term_link', 'wp_make_link_relative' );
https://codex.www.ads-software.com/Function_Reference/wp_make_link_relative
The quickest way to you find filter is plugin Debug Objects ( https://www.ads-software.com/plugins/debug-objects ). Install plugin, open some page (where are category or tag URLs), click on Objects on admin bar. Open Debug Hooks and try to find filter term_link. You can try to locate plugin/theme/code by function name. Please paste here entire block related to term_link.
You can send list of plugins, I can try to install all plugins if they are free and try to reproduce your issue.
I hope that’s helpful.