Shared calendar entries skewing to another date despite entry detail

Hi there,

We seem to be having an odd issue which has become more prevalent in recent weeks whereby our PA Team, who use a shared resource calendar, input entries, invite attendees etc. however the meeting will skew in the shared calendar to another point in time either months before or ahead of the actual meeting entry. The calendar entry stays correct in the attendee calendar.

When I search for the meeting entry, I can find it at another date - the meeting format is as inputted as well as the time however, it gets inputted to a half hour slot rather than the allotted time of the actual meeting e.g. an hour if that is what it is set to. The date is whatever the entry has gotten skewed to. The image attached shows a bunch of meetings which got moved from the dates they were scheduled for to a particular day in half hour blocks - The times are actually on the meeting but all sitting in at another time.


We've raised this as a ticket with Microsoft but they aren't coming back with anything fruitful. We've recreated the diary, migrated to Exchange 2016 from 2010 (where the issue was occurring also just not as prominent), removed and re-added the diary delegates, upgraded MS office versions etc. but nothing is working.

Any ideas anyone?

Thanks in advance.