Can't synch properly

Hi I'm on OsX Yosemite, and on a mac at work. When I add things or change things on the browser, it doesn't synch to the online folders, even though I'm using the green arrow synch button.
I don't know how to check if there are different versions running in different places but it's really disheartening.
I keep updating the folders on the browser window, then synching, and checking online and it doesn't make any of the changes.
Hope you can help, any advice gratefully received.
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