IPhone calendar entries not synced with MacBook calendar

I use my iPhone 4S calendar as my primary calendar for entering or modifying events for the simple reason that it's with me most, if not all the time.
But after upgrading my MacBook Air to Mountain Lion last week, calendar entries entered or modified on my iPhone no longer synchronize with the calendar on my MacBook Air.  As such, I have to manually make the entries or modifications on my MacBook Air so that the calendar will be updated when I synchronize it with my iPad.  Am not using iCloud, so the calendar on my MacBook is a local calendar (On My Mac).
Any thoughts on why this is happening and what can I do to fix this?

I have noticed a problem recently, although I can't absolutely be sure it's related to Mountain Lion on the computer.   Perhaps iCloud (which I set up, but am not really using yet).
My specific issue is that if I go into Calendar (formerly iCal) on the mac, and edit an already existing calendar event -- change the time, or move it to another day -- the change doesn't always sync through to the iphone properly.
Example: I had a recurring weekly event for 7:pm on a specific day of the week.  The start time got pushed back to 7:30.  I changed it on the mac, and sync'd to the phone.   However, the change did not get applied to the iphone calendar.  If I edit it on the iphone itself, it will sync back the other way correctly.
Same sort of problem occurs if I move an event from one day to another on the mac.  I will wind up with it showing up on BOTH days on the iphone.  If I delete an item, same thing.
It acts like the iphone versions of calendar entries are write-protected in a way.  If I edit them on the phone, the changes stick and sync properly to the mac.  If I try to do it the other way around, they do not.

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