[Plugin: Google XML Sitemaps] Problem with URLs [Beta]

Hi, I have a problem with the Beta version.

Here is what I get on my www.mydomain.org/sitemap.xml :
http://www.mydomain.org/sitemap-misc.xml 2012-04-20 12:00
http://www.mydomain.org/sitemap-pt-post-2012-04.xml 2012-04-20 12:00
http://www.mydomain.org/sitemap-pt-page-2012-04.xml 2012-04-20 12:00

Here is what I get on my mydomain.org/sitemap.xml :
http://mydomain.org/ 100% Daily 2012-04-21 17:34
http://mydomain.org/privacy-policy 60% Weekly 2012-04-21 17:34
http://mydomain.org/contact 60% Weekly 2012-04-21 17:34
http://mydomain.org/blog 60% Weekly 2012-04-21 17:34
…

My website is configured to be WITH www..

Could you look at this ?
(I already had www / non-www issues with previous versions, but not the same issue)

Thank you
Ben

http://ww.wp.xz.cn/extend/plugins/google-sitemap-generator/