Here is just the top of one of the stories I added just as a test. In this one, none of the chapters have the </meta> closing tag (not even at the bottom of the page, I did a search through all chapters and it came up empty for it. In the example I originally used, only the last, updated chapter was missing the </meta> but it had been added to all the other chapters, which didn't have those tags originally. Hope that makes sense...
Spoiler:
<?xml version='1.0' encoding='utf-8'?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>1. Chapter 1</title>
<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"/>
</head>
<body>
<h3>1. Chapter 1</h3>
<div class="storytextp" id="storytextp" style="padding:0 0.5em 0 0.5em;">
<div class="storytext xcontrast_txt nocopy" id="storytext"><p style="text-align:center;"><strong>~ Prologue ~</strong></p>
<p><em>Minerva McGonagall looked at the young couple standing in her office. She’d been head down over preparations for the Halloween Feast, always a problematic event that resulted in alcohol poisoning, dragging students out from behind bushes, and usually at least one assault. It was her least favorite school celebration but Dumbledore insisted on keeping it with sanctimonious noises about Samhaim and tradition and fun. How a party that was mostly about candy and purloined fire whiskey had anything to do with harvest festivals and the advent of the Horned God McGonagall had no idea but every suggestion that she add a bit of historical relevance to the curriculum was pooh-poohed.</em></p>
If you need me to add anything else for you to check, let me know.