my Ical and iCloud calendar aren't syncing
My Ical on my MAC (yosemite) and ICloud aren't syncing. If I click on an event sometimes it shows Mac and sometimes ICloud. I did have duplicate event but removed some of them and also some calendars that were duplicates were removed. The older events that are repeating are still showing on both but not the single ones. Yes I have looked on ICloud.com and the non repeating events aren't there. While I'm at it, I have a calendar that I can't remove because apparently it's an older (2008) .ics calendar. Suggestions?
MacBook Pro, OS X Yosemite (10.10.1)