I believe the issue is that you blindly copied the code without altering it to fit your page.
Here's a snippet from your page source:
Code:
<tbody id="collapseobj_module_12" style="">
<tr>
<td class="alt1">
<!-- ########## STEAM ID ######### -->
<script type="text/javascript" src="http://extremeg.org/forum/clientscript/vbulletin_profilefield_edit.js?v=382"></script>
<tr><td class="alt1" nowrap align="left">
<fieldset>
<dt class="shade" id="profilefield_title_9">Steam ID:</dt>
<dd id="profilefield_value_9">
<script type="text/javascript">
<!--
vBulletin.register_control("vB_ProfilefieldEditor", "9");
//-->
</script>
</dd>
</fieldset>
</td></tr>
<!-- ########## /STEAM ID ######### -->
</td>
</tr>
</tbody>
Do you notice how you've inserted code incorrectly? <tr><td>
<tr><td></td></tr> </td></tr>
Try fixing that.