[Plugin: WordPress SEO by Yoast] Sitemap broken

WordPress version: 3.3.2
WordPress SEO version: 1.2.2

I did this: activated sitemap XML, and the index looks ok
http://redapple.it/sitemap_index.xml

I expected the plugin to do this: creating 7 sitemaps for posts

Instead it did this: 3/4 of the 7 sitemaps are broken
BROKEN: http://redapple.it/post-sitemap1.xml
OK: http://redapple.it/post-sitemap7.xml

http://ww.wp.xz.cn/extend/plugins/wordpress-seo/