"Extra" meetings showing up in Meetings tab

I have noticed recently that some of the meetings I have scheduled are now appearing twice (in one case three times).  The 'extra' meetings have a different meeting ID/Zoom link than the original meeting, and individual users have been invited to these 'extra' meetings (I don't ever invite people to a meeting via the Zoom app).

I also recently added a 'Save the Date' for an in-person conference to my calendar, and that, too, is now showing up in my Zoom meetings (even though it is not a Zoom meeting). Once again, individual users are showing up in this meeting in Zoom (it looks like the same people who accepted the calendar invite I sent via Outlook).

Any idea what might be going on? I can't seem to find an answer. I didn't do anything to update/change settings between my Outlook calendar and my Zoom account and now I have all these extra meetings showing up...