Check the grid step size, also do you just load DTM?
I use 3m for grid step for contours.
Cool, I'll try that.
It has options to do DSM and/or DTM, which I hadn't fully read through.
I think you need DSM for vegetation and buildings but for contours DTM is all you need.
Also, maybe run lasinfo and see what it outputs to make sure you are in UTM coords.