I don't know the answer. In a Windows environment you have both user and machine credentials, and by default both are used. First the machine one when the machine is first powered on, and then the user one when the user logs in. That that user logs out and another user logs in then the user is 802.1x authenticated again. In Windows you can also configure a policy to only do machine authentication. It sounds to me you need an option like this for the Mac - machine only 802.1x authentication. This forum post seems to be loosely related to your issue. https://discussions.apple.com/thread/4433348?start=0&tstart=0
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