When you create an interview in Hiring, the organizer will assigned automatically based on the interviewers rather than the person who created the interview.
At the moment, the organizer is selected automatically by the system. When you add multiple interviewers, the person at the top of the list, based on alphabetical order, is assigned as the organizer.
If you want a specific person to be the meeting organizer, create the interview with only that interviewer first. Once the interview has been created, edit it and add the remaining interviewers. This preserves the original organizer while allowing you to include everyone else in the interview.