Code:
<link href="stylesheet.css" type="text/css" charset="UTF-8" rel="stylesheet"/>
<meta name="chapterurl" content="https://www.fanfiction.net/s/11360264/1/"/>
<meta name="chapterorigtitle" content="1. Chapter 1"/>
<meta name="chaptertoctitle" content="1. Chapter 1"/>
<meta name="chaptertitle" content="1. Chapter 1"/>
See how the tags end with
/>, just like the link tag for stylesheet? That makes it a self closing tag.
For most purposes
<x></x> and
<x/> are functionally identical. I left these tags as
<meta...></meta> because something (epubcheck maybe? or nook? don't remember now) complained about self closing meta tags.
So I speculate that the tool you're using to view the source with replaced
<meta...></meta> with
<meta.../>. It's not uncommon, especially for 'inspectors'.
tl;dr:
<meta...></meta> ==
<meta.../>. If it's not actively causing problems, don't worry about it.