sitemap missing urls

Hi,

I just purchased the plugin and it works great. But I noticed that it is missing urls from the sitemap. Example site has 115 posts and 27 pages published- but the sitemap only has 78 urls when it should have 142. ie http://www.reviewtrackers.com/sitemap.xml I can’t seem to locate the settings of the plugin, which may be the cause of this issue. Please advise. Thanks.