On Tue, Dec 14, 2010 at 08:22:15AM +0100, Hercule wrote:
Editcount register the edits made by a user. And contributions are the lines of history with his name.
So, when I rename a page I make 1 edit, but create 2 lines if history (the one on redirect will be deleted if someone cancel my renaming.
Many log events that affect pages add a "dummy" revision, which can show up in the page history and the user's contribs but will not be included in editcount. AFAICT the only things that do increment editcount are actually editing a page and uploading a new file (but not overwriting an existing file).
Also, AFAICT editcount is never decremented. Not even if someone moves a page over a redirect you created, which does seem to completely delete the old revision for the redirect beyond any recovery.
A case when you can have history line anterior to your registration is on history import. And, as you didn't made the edit it is not in edit count.
I was going to suggest that too. It's even possible for a wiki to have edits attributed to a user account that doesn't exist due to imports.