I know, this is clear as mud.
This is the client list that shows Administrator as the user that Meraki is using to assign content filtering. That is not the person actively logged in, but Meraki is pulling it from the event log due to a script running that has to have Admin authority to run.
These clients are authenticating with the actively signed in user. We need Meraki to ignore the Administrator account when it sees it so that it does not use it to authenticate for content filtering. That way it will only use the active user. (Hopefully that makes some sort of sense...)