Calendar Losing Events-Crazy!

I am using Mavericks on an iMac and iOS 7 on an iPad and an iPhone.
Up until the other day, they synched their calendars perfectly via iCloud.
But now....well this is crazy....
If I add an event on my iMac on any day after October 6th 2013 they show up on both iOS devices and in iCloud calendar and on the iMac. But anything prior to that date does not show up on either iOS device but does on the Mac and iCloud calendar.
Moreover if I add an event prior to that date on the iOS device itself it does show up on the devices for a second or two then disappears...but it appears and stays on the Mac and in iCloud calendar.
Finally, most events prior to that magic date that were on all devices have disappeared but only on the iOS devices. I say most because the other day (November 4), I added a new calendar (Medical) and changed some events that were in the Personal calendar to Medical) and it is events in these 2 calendars only that have disappeared prior to October 6. NOTE: This change took place in NOVEMBER, but the date in which things disppear prior to is in early OCTOBER.
To make it crazier, events in ANY CALENDAR added prior to October 6 disappear on iOS devices....not just the two aforementioned calendars.
IS THIS CRAZY OR WHAT?
Or am I crazy for actually tracking down what is going on to this level of specificity?
Now, if somecome can tracj down why its happening...if I haven't lost you yet...
Thx.

That solved a lot but not everything...it WAS set to synch 30 days before so thats where the October 6th date came from. I changed to all events. And now new events stay on the iOS device no matter where they were created.
BUT...the previous events that disappeared, are still gone....
any ideas?

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