Could you be more specific, and perhaps post a screenshot to demonstrate what exactly does not sync? You are telling on one line that sync is working correctly, but on the other one that it does nothing, so it is not quite clear what the problem really is.
Anyway, if the synchronisation really works, but the data is not appearing in your account, then it very probably means that your device is associated with multiple accounts. It frequently happens for example when you reinstall the application, and inadvertently sign up a new account instead of signing into the original one.
