Easyblog, Xmap and sh404SEF

I've got an issue with the Xmap sitemap and Easyblog.

In the XML sitemap, the urls look correct eg
http://singlepage.co.uk/blog/a-picture-is-worth-a-thousand-words

But the same post has a different url in the HTML sitemap:
http://singlepage.co.uk/sitemap/a-picture-is-worth-a-thousand-words

Note this url contains "sitemap" instead of "blog".

Here's my sitemap page:
http://singlepage.co.uk/sitemap


I'm using the Easyblog plugin for Xmap. I've updated the plugin to correct the "double slash" issue as described here:
http://stackideas.com/forums/xmap-plugin-double-urls-for-easyblog-items-only

Not sure whether sh404SEF is a factor here. I've tried deleting the sitemap, purging all sh404SEF urls, and creating a new sitemap but the problem persists.

I'm using Joomla 3.