Using the editors for Firefox and Chrome....

When <li> items that have ID attributes, using the editor to insert a new list item replicates the ID of the previous <li> item in the newly created item.

This behavior occurs in Firefox 3.08 and Chrome. This does not occur
with IE8 or Opera 9.6.1

This can be replicated by editing any HTML which has <li> items with
an ID attribute. The following source selection illustrates what happens...

Before Edit:

<ul xmlns="http://www.w3.org/1999/xhtml" id="10" style="margin-top: 0in;">
<li id="11">Federal and state regulatory documents</li>
<li id="12">Requirements documents</li>
<li id="13">Design documents</li>
<li id="14">Organizational policies</li>
<li id="15">Standard operating procedures</li>

</ul>

After Adding one item....

<ul xmlns="http://www.w3.org/1999/xhtml" id="10" style="margin-top: 0in;">
<li id="11">Federal and state regulatory documents</li>
<li id="12">Requirements documents</li>
<li id="13">Design documents</li>
<li id="14">Organizational policies</li><li id="14">This is newly added<br></li>
<li id="15">Standard operating procedures</li>

</ul>