Why is this an issue?
The admin role encompasses the sn_ca.campaign_admin role within its scope, which grant access to sensitive Human Resources data that should not be visible to the System Administrator.
Best practices
You should remove this HR-related role from admin to comply with best practices.
With admin access follow these procedures to remove the sn_ca.campaign_admin from the admin role:
In the Filter Navigator, search for User Administration > Roles
Search for admin
From the Contains Roles tab, click Edit
From the Contains Roles List column, highlight and move sn_ca.campaign_admin to the Collection column and Save
Log out and log back in to ensure that the changes take effect.