I'm wondering whether a plugin or something else is replicating them. I have a network plugin installed (multisite user management) http://wordpress.org/extend/plugins/multisite-user-management/ What is strange is that only a handful of users are replicated. There is no way that the 7 deletions I made that suddenly reappeared 1 minute later were done by bots. This happened to some of the users, not all.
What is worrying me is also that I discovered that I don't have any complete wp_install group. It looks like my first database begins wp_1_tablename. It doesn't look like this set is connected with any blog I use. The wp_site table is completely empty. I don't even know what wp_blogs is. I was running this from a wp 2.x - very early. Wondering if the upgrade may have caused some problems along the way that might also explain the user replication and login/cookie problems. It would seem that every blog has a wp_tablename table - unless you can delete the initial blog and create a new one without penalty... Below is the only set of tables I have for the initial set that most seem to have -- unless I converted this from a single site to mutlisite, which I probably did. This site does have users and a registration log as very recent. Not sure how to handle this.