I used the Wc3 markup validator to help me find a problem in my code, and I the code validator is throwing errors that I don't see in the html that I wrote....it looks like extra tags are being added to my markup....for example:

The site is at www.nationalcathode.com

Here is an excerpt of the code from my page:
<div id="leftwrapper">
<div class="specpg-left">

<div class="specpg-leftbluebox"><p>SPECIFICATION FOR COLD CATHODE LIGHTING SYSTEM</p> </div>

<div class="specpg-leftsub2a">
<p>HPE 2012/2027 </p> </div>

<div class="specpg-leftsub2b"> <img src="/wp-content/uploads/2012/01/specpg-neosq5.jpg" alt="National Cathode Logo" width="83" /></div>

<div class="specpg-leftsub3a2">
<p>120V or 277V</p> </div>

<div class="specpg-leftsub3b2">
<p>Per ANSI / IES RP-16-10</p></div>
</div> <!-- closes specpg-left -->



<div class="specpg-left">

<div class="specpg-leftbluebox">
<p>COLOR CHART</p>
</div>

<div class="specpg-leftcolor"> <img src="/wp-content/uploads/2012/01/specpg-colorchart2.png" alt="" title="specpg-colorchart2" width="308" height="190" class="aligncenter size-full wp-image-1141" />

</div>

</div> <!-- closes specpg-left -->

</div> <!--closes leftwrapper -->

And here is the code that I copied from the "view source"
<div id="leftwrapper">
<div class="specpg-left">
<div class="specpg-leftbluebox">
<p>SPECIFICATION FOR COLD CATHODE LIGHTING SYSTEM</p>
</p></div>
<div class="specpg-leftsub2a">
<p>HPED 10127 </p>
</p></div>
<div class="specpg-leftsub2b"> <img src="/wp-content/uploads/2012/01/specpg-neosq5.jpg" alt="National Cathode Logo" width="83" /></div>
<div class="specpg-leftsub3a2">
<p >120V or 277V</p>
</p></div>
<div class="specpg-leftsub3b2">
<p >Per ANSI / IES RP-16-10</p>
</div></div>
<p> <!-- closes specpg-left --></p>
<div class="specpg-left">
<div class="specpg-leftbluebox">
<p>COLOR CHART</p>
</p></div>
<div class="specpg-leftcolor"> <img src="/wp-content/uploads/2012/01/specpg-colorchart2.png" alt="" title="specpg-colorchart2" width="308" height="190" class="aligncenter size-full wp-image-1141" /></p>
</div>
</div>
<p> <!-- closes specpg-left --></p>
</div>
<p> <!--closes leftwrapper --></p>

Where are the extra tags coming from?

Thanks-

looks like some kind of plugin, it's not from the theme