Altitude Issue using Lidar Lite v3HP go to Zero

Somebody had this problem before?
We are using a pixhawk 2 cube with arducopter Version 3.6.1, a pixy camera and irlock over hexacopter dron
We made a take off, after this, the dron goes up.
we noticed that lidar’s altitud is too hi, thats the normal
as show below

I’ve moved this to the Copter-3.6 category 'cuz it was a “blog” so appeared on the front page of