Overview

You would notice that when you create a new group or a user under a particular team, it also shows up under the Global Team as well and appears as if a duplicate group or user got created under the Global Team. You want to know if this 'duplicate' group/user should be deleted. 

Information

The Global Team is the highest level team for an organization. It contains all of the users, groups, and teams in the organization. If a group or a user is created under a team, then, it will automatically be included as a part of the Global Team and is not a duplicate. Refer to this article on Managing Teams to know more about the Global team.