Windows Phone 8.1 calendar sometimes does not update Windows Live calendar on Cloud

I have a Nokia 928 on the Verizon network running Windows Phone 8.1 (8.10.14203.306 - Lumia Denim).  I synchronize my phone calendar with Windows Live calendar.

My problem is that some calendar entries that I make on my phone do NOT sync to the Windows Live calendar.  Therefore, they don't show up on my PC calendar and my life gets out of sync.  But other calendar entries I make on my phone DO sync properly.  The non-syncing phone entries include calendar requests that come from gotomeeting (that I accept on my phone) and other meeting requests that don't identify how they were created (but that I accept on my phone).

Any entry I make on the PC syncs properly to my phone.

Is there a bug in the code that accepts meetings on the phone that it goes into the phone's calendar but not to the Windows Live calendar?  When I edit the event on the phone's calendar, I don't see anything different about it - at the top of the screen it says that it is the proper calendar for the Windows Live calendar.

Thanks.