Why do events keep disappearing sporadically from my iMac calendar? It is inconsistent which is driving me crazy. When I do a followup for an event that I've entered, I find that even though I entered it on my iMac it hasn't transferred to iCloud (which means, of course, that events don't get to my iPhone.) I am running High Sierra (10.13.6). I keep thinking that I'm not finishing the entry somehow but I don't detect differences in the way I enter events.