How to Find Hidden Users on WordPress

1. Make a backup of your WordPress database. This can be done from phpMyAdmin, or through your WordPress Admin Panel by installing the WP-Optimize or WP-DBManager plug-in. A backup is important before trying to resolve your problems in the event you delete a table entry that causes your Web page to malfunction.
2. Access phpMyAdmin for your WordPress database. This tool is provided by your Web host, but may also be accessed through your WordPress Admin Panel by installing the wp-phpMyAdmin plug-in. Once inside, a list of your database tables will appear on the left-hand side, with the table details appearing on the right.

3. Locate and click on the wp_users link in the list of available tables. Click on the browse tab on the right side. A list of users for your WordPress installation will appear below.
4. Locate the problem user account and click the delete icon in its table row. If prompted, confirm deletion. Repeat this step to remove any remaining accounts you have not approved. If the problem user was not visible in the list, you may have a reporting error instead. Disable all your plug-ins, switch themes, then switch back to reset the counts and verify whether hidden users really exist.
5. Return to the User page or Dashboard in the WordPress Admin Panel to confirm the problem has been solved.