There is a rear ride height sensor that is intended to tell the vehicle when it has significant load in the back that causes the suspension to sag. In this condition, you'd want to point the headlights down, so oncoming traffic isn't blinded. On previous years there was a manual adjuster knob on the left side of the dash, but you 16+ guys got some extra features.
In the case of a lift, the sensor interprets it as the rear of the vehicle sitting higher than normal, so it points the headlights up. Plus, your front is higher as well, with no feedback to the "brain", so they end up extra high. This is what happened for you.