I’m getting empty tags in my page that aren’t in the page source, but are visible upon inspecting the element via firebug. I’ve disabled javascript to see if that was injecting it, as well as disabling all add-ons.
Here is an excerpt from the page source, free of random <a></a>:
...
<div class="middle-content">
<div class="asu_set_fixed_width">
<div id="navbar">
<div id="navbar-inner" class="clear-block region region-navbar">
<div class="region region-navbar">
<div id="block-menu-primary-links" class="block block-menu first last region-odd odd region-count-1 count-1">
<div class="content">
<ul class="menu"><li class="leaf first active-trail"><a href="/index" title="Home" class="active">Home</a></li>
<li class="leaf"><a href="/About_CUbiC" title="About CUbiC">About CUbiC</a></li>
...
and now examining with firebug with javascript disabled:

Same thing happens in Chrome as it does here in Firefox. Any thoughts on where these are coming from?
Validate your HTML.
http://validator.w3.org/check?uri=http%3A%2F%2Fcubic-dev.asu.edu%2F&charset=%28detect+automatically%29&doctype=Inline&group=0
end tag for "a" omittedstart tag was hereThe snippet of HTML in question is this (I added line breaks):
There should be an
</a>at the end there instead of<a>.