I've subscribed to a public folder used by my department. The calendar events show up, but when the person who made the entry deletes the event or makes an edit, or moves it to a different date, my calendar doesn't update it properly so I end up seeing duplicates of events (i.e. the original entry and the edited entry). I have to right click on the subscribed folder, select Folder Properties, and empty cache manually to see the most recent version of the calendar. I get "An error occurred while updating the calendar event" errors for all entries when I sync them. What can I do to fix this issue?

P.S. Everyone else in my department is using PC and they have no problems. I'm the only one with Mac, and hence the only one with this issue.