[Forum] Member count dropped 2k

[PJKCards]

I recently upgraded my forum from 3.6.7 to 4 publisher suite. My member count dropped from over 10k to 8.8k. I checked this, but it did not resolve the issue:

http://www.webcosmoforums.com/forum-management/19591-member-count-drop-incorrect-vbulletin-4-upgrade.html

Why did the count drop, and how can I fix it?

Thanks