One way sync, iPhone/iMac/MBP

I have an iCloud sync problem on my devices. When I make an appointment in iCal on my computer, either my iMac or my Mac Book Pro, it shows up on the computers but NOT on my iPhone.

When I make an appointment in iCal on my iPhone it shows up on my computers????? There's only one way sync...........

Any help?

Regards

Henrik