ANSWER: The user is a member of two groups - Users and Administrators. Statistics is shown for the first found group in which the user is a member. You need to create separate group for the user and to add it in Print Logger configuration. Also you should remove Users and Administrators groups from the Print Logger configuration.

NOTE: For best results you should create special groups for Print Logger to organize your users in your own manner. Each user can be a member only of the one special group.