My settings in the Table of Contents section of conversion are the defaults.
I don't get this problem with most of the html I convert. I am a bit tired now so not up to experimenting but will have a go sometime this week at recreating the problem and then paring down and seeing what html is causing it.
In truth, I had never used the Edit ToC plugin until it was mentioned here lol and had been converting, transferring the epub to my tablet and checking it lol. This is much quicker.
I have to wonder if it is the nested divs or the ids on the divs that is doing it. But like I said, I'll experiment when I have the time and energy to.
I just took another look and think perhaps the problem is the class on the nested div tags.
I have class="chapter" on the entire chapter and then the other chapterHead, chapterNumber classes nested. LOL no wonder I prefer to redo the html myself. I will try changing the class names and see if it gets rid of the problem.
(the following is how each chapter is coded.
<div class="chapter" >
<div class="chapterHead">
<h2 class="chapterNumber" id="ch01">
<span class="bold">Chapter One</span>
</h2>
</div>
<div class="chapterBody">
<p class="chapterOpenerText">The bust was about to go down.</p>
many paragraphs
</div>