I am userid #2 but I'm the first user. That's just how phpBB works*.
* This forum is NOT phpBB and is NOT based on phpBB but I did import the data from the old phpBB board into this one with a very hackish and overly complicated script.
As I write this there are 1448 users in the database. At least 400 users have been deleted. Google doesn't index everything. For example, users who have never posted have no links to their user pages so there's no way for google to find them.