Lines on all photos engravings with my 40" Universal engraver

I’m having line problems with all the engravings I do on my 40" Universal engraver. I don’t have these problems with my Neje using LightBurn.

Why the difference in lasers and machines with LightBurn?

The bottom 2 pictures are with the NEJE.



These 2 photos are with my Neje and no lines.