Site (99) is the corporate site, using which the Admin can view the collective data of all sites in one single session. Site (99) is assigned to the Center Admin by default. Center Admin email is available on Step-1 of Settings page under Contact Info. 

You may either,

1. Change the Site Id of your staff entry from Staff Profile page. This will give you an option to log in as Site Admin or Center Admin when you log in to your account.

2. You may choose sites other than Corporate Site (99), from Profile drop-down to view particular site data.

Other Sites are regular sites using which the Admin can view details of selected Site only.