I have seen this occur before but it just noticed it's occurring yet again.
At the end of last month I noticed my image sitemap mysteriously dropped 2 images, meaning the indexed image count is now 2 less even though none have been removed from the site.
Today, I moved two threads from a private viewing area to a public area and when I ran the sitemap geneerator the total indexed pages dropped by 5. I doubled the depth rate from 125 to 250 and re-ran the generator with the same result. I also don't understand what criteria is used to skip pages and why the generator even skips pages - what purpose does this serve? I just doubled the depth again to 500 and re-ran it again and have the same, reduced results.
Why would this behavior occur and what can be done to resolve it? At this point I don't know if this is performing properly and if my site is being properly indexed.
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