The below query can reset the moderator emails.
Code:
UPDATE `jos_users` SET `setEmail` = 0
Replace jos_ with whatever your database prefix is and run directly in phpmyadmin. Now edit the users you want to receive emails and set them to receive moderator emails. My guess is a user was set by accident to receive moderator emails.
Also ensure your moderator view access level in CB > Configuration > Moderator is not causing every CB user to be a moderator (e.g. if it's Public or Registered it is likely misconfigured).