I've got one extra line of introduction that should not be there

[Mosh]

It looks like you do have two notices, if you look at the xhtml source you will see such is the case:

<ol>
			<li class="restore" id="navbar_notice_1000">

	
	&nbsp;
</li> <li class="restore" id="navbar_notice_1004">
	
	If this is your first visit, be sure to
		check out the <a href="faq.php?" target="_blank"><b>FAQ</b></a> by clicking the
		link above. You may have to <a href="register.php?" target="_blank"><b>register</b></a>
		before you can post: click the register link above to proceed. To start viewing messages,
		select the forum that you want to visit from the selection below.
</li> 
		</ol>

This is the culprit:

<li class="restore" id="navbar_notice_1000">

	
	&nbsp;
</li>

If you do not have two notices in the Notice Manager in the AdminCP you may want to lodge a support ticket at vBulletin.com so that they can take a look at it.