In the following XML we can see that the 'faq' page appears 3 times. I would think that should not happen.
In that one file I had 257 <loc> tags, 238 are distinct. (19 duplicates)
<?php
xml version="1.0"encoding="UTF-8"
xml-stylesheet type="text/xsl"href="/sites/all/modules/xmlsitemap/gss/gss.xsl"
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9
http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd">
<url>
<loc>http://www.turnwatcher.com/aggregator/sources</loc>
<priority>0.5</priority>
</url>
<url>
<loc>http://www.turnwatcher.com/archive</loc>
<priority>0.5</priority>
</url>
<url>
<loc>http://www.turnwatcher.com/blog/4</loc>
<priority>0.5</priority>
</url>
<url>
<loc>http://www.turnwatcher.com/doc_tutorial</loc>
<priority>0.5</priority>
</url>
<url>
<loc>http://www.turnwatcher.com/faq</loc>
<priority>0.5</priority>
</url>
<url>
<loc>http://www.turnwatcher.com/faq</loc>
<priority>0.5</priority>
</url>
<url>
<loc>http://www.turnwatcher.com/faq</loc>
<priority>0.5</priority>
</url>
<url>
<loc>http://www.turnwatcher.com/forum</loc>
<priority>0.5</priority>
</url>
<url>
<loc>http://www.turnwatcher.com/install_turnwatcher</loc>
<priority>0.5</priority>
</url>
?>