Calendar invite being duplicated and sent to attendees after user accepts

Issue:

1. User receives a calendar invite from inside OR outside the organization and accepts
2. A duplicate invite is being sent automatically to all attendees (but not the origanizer) from User for the same day 30 minutes after accepting

Example:

1. User 1 receives an invite from Organizer 1 for "Company Event ABC" on 10/15/23 at 3pm. Attendee 1, 2, 3 also receive the invite.
2. User 1 accepts the invite on 10/2/23 at 1pm
3. Attendee 1, 2, 3 are automatically sent an appointment from User 1 for "Company Event ABC" for 10/2/23 at 1:30pm. Organizer 1 is NOT sent the invite.
4. User 1 is NOT sending the invite. It is happening automatically. It only happens with User 1. No other users appear to be affected.

We were able to replicate the issue. User 1 accepted the invite on an iPhone.

User is in an Exchange environment using iCal