Calendar meetings changing times after being modified

I have only a couple clients out of about 50 who have this issue.
I have a user (A) who is a delegate of user (B).
User A created a meeting on Alex's calendar using outlook client 2010. Meeting is for Alex and Steve.
On 4/10/15 9:30-10:30 - user A moved the meeting to 4/23/15 9:15.
It was verified that the meeting modification shown up on the Outlook 2010 client for Alex.
The following day, the meeting reverted back to 4/10/15 9:30-10:30 and it appears as if it reverted back at the original time of 9:30.
The meeting that reverted on Alex's calendar did not have any updated notes either, however, Steve's Calendar in OWA/ user's A delegate view had the correct meeting date with the updated notes.
User A seems to have several similar issues of meetings reverting back after being modified but this seems random. It doesn't always happen and user A schedule many meetings per day.
Things I have done:
Rebuilt OST files for all users, Created a new Outlook Profile for all users, reinstalled Outlook 2010 on all desktops, enabled the Calendar Repair Assistant for all users. Made sure all software has been updated to the most current updates as well as windows.
Anything else that may be done or that can figure out why the 1 user who is a delegate of Alex and Steve seems to be the only person who has issues with Calendar meetings?
Thanks for any time and effort placed on this as I am at the end of my ropes ;)

Hi Chamber,
Before going further, I'd like to ask the following questions to narrow down the issue:
1. Are the affected users connecting to their Mailboxes from multiple clients?
2. If Alex check the meeting date via OWA, is there the same issue?
In addition, base on my research, I recommend you try the following methods and check if any helps:
1. Don't use Exchange cache mode
2. Let the user use a single client to connect his mailbox
3. Try to move these affected mailboxes to another database
Best regards,
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]
Niko Cheng
TechNet Community Support

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Calendar meetings changing times after being modified

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