Maybe you are have a different Kinect model
"Kinect Models
As of 12/14/2013, there exist four different models of the Kinect:
The original Kinect-for-Xbox, released in November 2010, with model number 1414. Until version 2.8 of the Kinect package, this was the only supported Kinect model.
The new Kinect-for-Xbox, model number 1473. This was an upgrade to make the Kinect-for-Xbox compatible with the then-new Kinect-for-Windows. First supported in Kinect package version 2.8.
The Kinect-for-Windows, model number 1517. First supported in Kinect package version 2.8.
The Kinect 2.0, released together with the Xbox One in November 2013. Not yet supported by the Kinect package.
The main difference between models 1414 on the one hand, and models 1473 and 1517 on the other hand, is the arrangement of the Kinect's sub-devices (camera, microphone array, tilt motor, internal USB hub). In model 1414, the camera was the "main" device, and had the Kinect's serial number attached to it. In models 1473 and 1517, the serial number is now attached to the microphone device, and the camera device's serial number is bogus."
copied from this link:
http://idav.ucdavis.edu/~okreylos/ResDev/Kinect/MainPage.html