Calendar Appointments Unexpectedly Changing Color

In our office we are using Outlook 2010 (v14.0.7116.5000) with Exchange accounts on Exchange Server 2010 (v14.02.0387.000), and we share calendars between staff members.  We have specifically assigned category colors for certain appointments. 
We have one shared calendar where appointments will randomly change color.  The appointments are always red on this calendar when viewed from the owner's account.  But when other staff members view this shared calendar, the appointments will sometimes
turn yellow (even though the category still says red.)  This issue seems to appear at random, surfacing for a few days and then returning to normal.  The color changing only affects certain users at any one time, as the appointments will appear yellow
for certain staff and then red for others.  And this issue is isolated to only one shared calendar; we have no issues with the 30+ other shared calendars.  Any ideas what could be going only?
Any help is greatly appreciated!
-Anthony

Hi Anthony,
There is no feature in Exchange side to manage calendar view in Outlook. Since the issue only happens to one specific shared calendar and specific users, I suggest we can ask a question in
Outlook form
for further troubleshooting.
Personal suggestion, please start the specific users' Outlook in safe mode to have a try.
Regards,
Winnie Liang
TechNet Community Support

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