Why on the organization guest some people are members.

Why on the organization guest some people are members, some people are members like this, will they be charged seat? and where can the admin adjust the member to be a guest? I just made convert From workspace to organization. I can manage change to guest?
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Member here means “Member of the team” I believe it has nothing to do with a Member in the sense “Paid seat”.

I’m not sure if a case like this will be charged or not.

It depends on the way your billing is setup. If you are on a Workspace, you pay for everyone. Every other cases you don’t pay for guests. Check out your Admin Console for more info.