[Plugin: Google XML Sitemaps] Google shows the wrong directory

I have a problem with the XML sitemap generator. I’ve activated it and searched in the Google webmaster tools for the sitemap. So far so good. Now when I search on Google I find : http://www.website.com/wordpress/page instead of http://www.website.com/page . It adds the directory where wordpress is installed.

Does anyone has an idea how to solve this?