Well, by trial and error I have narrowed it down.
This works:
Code:
<h1 id="heading_id_2" title="Chapter 1 - Rosella">Character Portrait: <i>Rosella</i></h1>
This doesn't:
Code:
<h1 id="heading_id_2" title="Chapter 1 - Rosella">Chapter 1: <i>Rosella</i></h1>
The ONLY difference between those two lines is the actual text:
Character Portrait: Rosella and
Chapter 1: Rosella.
It almost seems like the page is being split because of the word "Chapter". Can that be possible? Is there a way to prevent that?