Sitemaps and SEO wordpress MU Style plugin - Homepage is not listed in the sitemap.xml

Here goes one more problem.
I don't see the homepage listed in the sitemap.
Here is sitemap for one of my Wordpress MU blog:
http://allmoviereviews.co.uk/sitemap.xml

I've checked it on my other MU blog and can't see the home page being listed in the sitemap.xml.

Any thoughts ?