Nested ordered list does not format inside an unordered list

Redhat EL4 WS
Drupal 5.3
Firefox 2.0.0.11

The following is actually nested inside a larger ordered list.

Each segment will contain,

  <ul>
  <li> UGC line, and date time stamp </li>
  <li> The Phrase, THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A</li>
  <li> Bullets that include</li>
  </ul>

    <ol>
    <li> The type of advisory, the hydrologic condition, and area affected area.</li>
    <li> The time the warning ends.</li>
    <li> Basis for the warning</li>
    </ol>

  <ul>
  <li> Call to action statement</li>
  <li> Latitude/longitude coordinates that define the warning area.</li> 
  </ul>

When it displays as a page in Firefox, it looks like;

Each segment will contain,

    o UGC line, and date time stamp
    o The Phrase, THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A
    o Bullets that include
         o The type of advisory, the hydrologic condition, and area affected area.
         o The time the warning ends.
         o Basis for the warning
     o Call to action statement
     o Latitude/longitude coordinates that define the warning area.

(nesting is correctly indented, but all the 'bullets' show up as empty circles instead of circles with nested numbers.)

The weird part is that if I cut and past from the Drupal page to an external text editor window, it is formatted correctly. So now I'm in a bit of a quandary, is this a problem with Drupal rendering nested lists, or Firefox?

Another thing is that it seems to properly format in this message, so maybe it is just a matter of waiting for Redhat RPMs to catch up with where the main site is now.