difference iexplorer vs firefox

The (exported) textflow (below) gives me different results in iexplorer and firefox.

In iexplorer I get an extra linefeed (which is wrong). Both in Windows/XP flash plugin 10.0.22.87

Is this a bug?

iexplorer:

•ul1

•ul2

firefox:

•ul1

•ul2

<TextFlow lineBreak="inherit" paddingBottom="inherit" paddingLeft="inherit" paddingRight="inherit" paddingTop="inherit" verticalAlign="inherit" styleName="tlfGlobal" whiteSpaceCollapse="preserve" xmlns="http://ns.adobe.com/textLayout/2008">
  <div>
    <div>
      <p id="UL1-@-2-@-partag" styleName="UL1">
        <span id="ignore">
          •
        </span>
        <span id="3" styleName="UL1">
          ul1
        </span>
      </p>
      <p id="UL1-@-5-@-partag" styleName="UL1">
        <span id="ignore">
          •
        </span>
        <span id="6" styleName="UL1">
          ul2
        </span>
      </p>
    </div>
  </div>
</TextFlow>