This is probably not a problem with your plugin, but the xml sitemap feature doesn't play nicely with the SlideDeck WP Pro plugin (from http://www.slidedeck.com). The xml sitemap is adding URLs to draft (unpublished) pages and "slides" that are generated from the slidedeck plugin. I'm assuming this is an issue with their plugin not yours. However, do you have any suggestions of how I can deal with this and/or what info I should relay to their tech support.
FYI, I am working on this site on a localhost so I can't share a link. However, I can email you a copy of the sitemap.xml if that would help.