Number of posts are not consistent even on same page

Below each post the reputation is shown and the number of actual posts. However, the number of posts very even on the page (for the same user).

The attached picture has been taken from post http://forum.qt.io/topic/52585/qprocess-documentation-is-inconsistent/2

I had opened my initial post and added the bug tag. HOwever, I have never added the second. Do not know if this matters. However, I have seen a similar behaviour before with another post. I know that Chris Kawa has edited one of my posts at that time.
All over, it may be simply a timing issue. In the first occurance it was corrected automatically.