If so, please report it to Forum Feedback. Here it is for your reading pleasure:

Tip: If you are asking for help to troubleshoot a computer-related problem, please be sure to include all the necessary information (ie: operating system, model number, hardware, software, etc) that will help others identify your problem for a speedy resolution.

What's missing from your post is:

a. What version of Outlook you are using.
b. If the versions are different, tell about it.
c. If Office update is ... uptodate.
d. How the calendars are shared. If not Exchange then you're probably off the support map.