Changes to lists when structured topics are sent to RoboHelp

Question

In FrameMaker I've created several DITA topics (no specializations, just topics) and included them in a ditamap. I mapped my Frame template styles to my RoboHelp .CSS styles. Then I linked to the ditamap from a RoboHelp HTML project. The topics came over and the style mappings work, but any <li> items with multiple elments are changed. For example, if I have this in my structured FrameMaker file:
<ul>
    <li>
        <p>This is the first list item.</p>
        <p>This is additional information about the first list item.</p>
    </li>
    <li>This is the second list item.</li>
    <li>This is the third list item.</li>
</ul>
I get this in my RoboHelp project:
<ul>
    <li>
        <p>This is the first list item.</p>
    </li>
</ul>
<p>This is additional information about the first list item.</p>
    <li>This is the secton list item.</li>
</ul>

Answer 1

Oops -- somehow posted this too soon. This structured Frame/XML:
<ul>
    <li>
        <p>This is the first list item.</p>
        <p>This is additional information about the first list item.</p>
    </li>
    <li>This is the second list item.</li>
    <li>This is the third list item.</li>
</ul>
Results in this RoboHelp HTML:
<ul>
    <li>
        <p>This is the first list item.</p>
    </li>
</ul>
<p>This is additional information about the first list item.</p>
<ul>
    <li>This is the second list item.</li>
    <li>This is the third list item.</li>
</ul>
Is there any setting I can change to prevent this from happening? Or any other workflow I can consider?
Thanks,
Melanie