Delegate's calendar affected by scheduling meeting for delegator

I have two users that are delegates for different people. They are able to schedule meetings/Zoom meetings in Outlook for their delegators. I have confirmed the meeting is showing up on the delegators' web portals as being the host. When the time comes for the meeting, the Zoom presence status for the delegate will switch from available to in a meeting, even though nothing is on her calendar. The only calendar that is showing any appointment is the delegator. As of right now, Zoom support has been unable to duplicate the issue and can't assist with resolving the issue. Has anyone experienced anything like this?