[InsaneContender]

Your code isn't XHTML 1.0 Traditional valid. Here's a quick fix...

Change:

<tbody id="collapseobj_quote_$show[quoteid]" style="{$collapseobj_forumid}">
  <tr>
    <td class="alt2" style="border:1px inset">
      <if condition="$show['username']">
        <div><phrase 1="$username">$vbphrase[originally_posted_by_x]</phrase></div>
        <div style="font-style:italic">$message</div>
      <else />
        $message
      </if>
    </td>
  </tr>
</tbody>

To this:

  <tr>
    <td id="collapseobj_quote_$show[quoteid]" style="{$collapseobj_forumid} border:1px inset" class="alt2" style="">
      <if condition="$show['username']">
        <div><phrase 1="$username">$vbphrase[originally_posted_by_x]</phrase></div>
        <div style="font-style:italic">$message</div>
      <else />
        $message
      </if>
    </td>
  </tr>

Getting rid of that tbody tag takes care of it.