I have 3 iPhones and an iPad syncing the calendar, mostly they work and I have just checked each to ensure that they are all set to sync over iCloud. However, I keep losing appointments that I know were in my phone previously. Over the last couple if days it has happened half a dozen times or so - so far I have got away with it but my memory is not good enough not to use the calendar, and I find the phone the most convenient way of doing it.
Does anyone have any ideas why this might be happening? It's driving me crazy so any help would be greatly appreciated.