MacBook Pro won't sync with iPhone but iPhone does

Since upgrading MacBook Pro to OS X Yosemite and each of iPhone and iPad to iOS 8.1.2, whilst appointments made on iPhone and iPad appear on Calendar in MacBook Pro, those made on MacBook Pro don't appear in Calendars on my iPhone and iPad. Tried iTunes sync with cable, WiFi while connected to power, have read Forums, etc but no luck. Effectively "One way sync" only. Has any one else experienced and rectified this issue??

Howdy Ralph,
Welcome to Apple Support Communities.
The article linked below provides a lot of great information and troubleshooting tips that can help you resolve the issue syncing Calendar events on your MacBook Pro to your iOS devices.
Sync Services: Advanced troubleshooting for contact and calendar syncing - Apple Support
Cheers,
-Jason

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