Hello Matt,

looking at your sitemap i see that it's generated as expected and as the sitemap formats are defined by Google.
Maybe you expected something different?

An XML sitemap for images has to be generated separately, you can't have an image location inside an XML sitemap or a GNews sitemap.
Also the intro text is not allowed in the XML for sitemaps, the intro text can be included only in the RSS feed.

Let me know if you need some more explanations.

best regards

John