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.

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