User blog comment:BertH/Technical Update: March 9, 2016/@comment-1251315-20160310165827/@comment-452-20160311173246

SuperSajuuk, I have also noticed this, and also care about accurate statistical reporting. If the number isn't correct then it just shouldn't be displayed - Wikia have removed several stats recently due to them being incorrect, so they obviously agree.

My own masthead and UserActivity edit counts are also very incorrect, in one case 30k less and 50k more respectively, probably due to the fact that I often use the import function.

I use the import function often in three ways:
 * As a simple way to create pages en masse - such as a series of redirects.
 * Mass updating templates - I was looking forward to the Flags feature so I could stop having to do this, but so much for that.
 * When merging wikis, to move the edit history from the wiki being closed to the wiki receiving the merged content - this maintains the edit history to comply with the Creative Commons license.

I checked my own Special:Editcount on a couple of wikis, and was surprised to find that it matched Special:Contributions - I assumed they were all wrong. I had enough trouble getting to be accurate, I wasn't going to bother with my edit count.

What I think is strangest about all of this is not that the numbers are incorrect, but that different pages show different numbers - why aren't all pages just retrieving the number from the same source, or at least syncing regularly if they're cached?

A minor issue: on citybuildinggames, Special:Editcount says you have 3,657 edits, but there are only 3639 on Special:Contributions, counting the 19 "Archived revisions" brings it up to 3658 - off by 1. Perhaps it was correct when you checked, does that number sync daily?