I checked the number of posts and found a difference between the visible number per user and the
actual number.
The number appears to be true for my account but is wrong for some accounts."If we ignore posts in Serious discussion/ Ivory Tower / mods"
- KingScorpio: number of Posts: 3015 actual number 3047
- BillyBobZorton: number of Posts: 3211 actual number
3106 3211
- Jet Cash: number of Posts: 4007 actual number
3792 4190
- Theb: number of Posts: 1805 actual number 1771
- d5000: number of Posts: 4610 actual number
4509 4610
and more.
check it
Do you know...
1. Posts do not get counted in Serious discussion section
Bitcoin Forum > Other > Serious discussion
2. Both Posts and Activity do not get counted in Ivory Tower section.
Bitcoin Forum > Other > Serious discussion > Ivory Tower
- Posts in Serious Discussion only activate a potential-activity period. They do not increase your post count.
- Posts in Ivory Tower neither activate a potential-activity period nor increase your post count.
For this reason you are seeing the difference between their number of posts under their username and actual number of posts on the post history page. 
Sorry I did not see the last part of your first paragraph.
I made some corrections and seems like we both have different results. Can anyone else confirm their numbers for the mentioned users?
You need to account for deleted/hidden/removed posts
But it should show the same number for everyone in the history page. Isn't it?