Sitemap failing on Google.

I have started trying to look at my google analytical and notice I keep getting this error on ll my forum posts:

URLs not followed
When we tested a sample of URLs from your Sitemap, we found that some URLs redirect to other locations. We recommend that your Sitemap contain URLs that point to the final destination (the redirect target) instead of redirecting to another URL.

One of the links in question is:
whomever it is/was!!!!!!!

The page looks fine. What is the issue and how can I correct this?

Hello,

You should remove 'showpost' urls from the sitemap when using the vbseo permalink options for showpost. You should upgrade to sitemap 3.0 pl1 as well if you haven't already.

Hi:
Is better to disable to remove showpost urls from the sitemap or to disable permalink options for showpost? numbers of urls on sitemap is much lower.

Thanks.

Yes, a decrease in sitemap count is expected and normal. You will only be submitting 1 url for the entire thread page instead of up to 11 (if post per page is set to 10)

vBSEO Sitemap Generator : Quality vs Quantity - vBulletin SEO Forums