I have 50,000 posts in my site.
I created a sitemap using your plugin and submitted it to Google and checked it to see that it had 50,000 URLs mentioned for each post.
Now, when I go back to Google webmaster tool and check the number of links that the sitemap contains, it says only 20,000 URLs.
I have checked almost after a month and I have never used the XML sitemap generator plugin in that span of time.
My question is, is this reduction in number of URLs in the sitemap within a period of time, normal?
If so, can you kindly explain why this happens?