Admin shows 4, the user summary shows 23, this user has 0 pms.
Could it have something to do with the stats job?
This account in particular is an imported one, and is still dormant, but I’ve seen the same with active users.
The 23 posts shown in the user summary are all there.
EDIT:
I’m seeing the same (significant) differences on both our live site and my test machine.
I ran across it while working on user merge and consolidation ideas on the test site: I was in /admin and saw “3 posts”, which is lower than max posts to delete, so I hit delete & got an error. Then I went and looked at the user summary.