If you print out the model or serial number instead of the address for the trackers you find you will see more useful information about tracker the SDK detects. My guess is that you are using a computer with some preinstalled Tobii software for consumer use (Tobii Aware), and that this is the device you are detecting.
It should be easy to filter out the device you are really interested in by checking the value of the eye tracker model. This is faster and better compared to trying to subscribe/unsubscribe to gaze.