Yosemite imessage not in sync with iPhone 6

I have latest software on both Macbook and iphone 6 plus.

My imessage thread on Macbook is not in sync with the message thread on my iphone for a given phone #.

For example, on a given day and recipient/phone # I can see a whole bunch of message exhange on Macbook iMessage. Those same messages do not appear on iPhone messages for that same recipient and day.

Bottom line all message threads on iPhone are not in sync with iMessage.

Does anyone know how to fix this?