Yes, I am the culprit.
I did a tidy up of the Askaboutbusiness forum and deleted a lot of posts.
After that, I reset the counters, so ClubMan is down to 32,000 odd.
It only matters if someone has fewer than 50 posts. It will take them longer to achieve Frequent Poster status.
All the posts were over 365 days old, so it won't affect recent posters in any way.
A lot were posts with no replies. Huge amounts of duplicates.
The benefit is that searching using a search engine or using the archives is a lot easier.
Brendan