So I just installed my M27. I've been playing with the park assist and noticed one of the heads is a lot less sensitive to distance (reflecting off white box) than the other. About 50% less to be exact. Is this because one of the heads is upside down? Is park assist a "joke" so to speak and not really supposed to work or do I have a defective head? This makes me worried that the head has issues and wont work against lidar.