For what it's worth, I took a look at the epub. It's a mess. One example is here where a second <title> tag is inside the body tag along with the <style> tag.
Code:
<head>
<title></title></head>
<body>
<title>ACKNOWLEDGEMENTS</title>
<link href="../Styles/mnc_toc.css" type="text/css" rel="stylesheet"/>
<style>
div.container {
text-align: center;
}
ol.mnc {
display: inline-block;
text-align: left;
font: 16px Arial, sans-serif;
}
</style>
There were also naked <br/> tags, etc. The } at the end of the stylesheet was missing, etc.
I did a quick and dirty 5 minutes cleanup and have attached that file to this message.
I hope that looking at what was done will give you some help.