Engraving cutting through at outer edges?

Hey there wonder if anyone has come across this before. I use lightburn with my 45W k40 laser and I’ve been cutting and engraving fine until the other day when I started a job. The raster engrave is making a gradient fill…which I know you currently can’t do on lightburn…its actually firing through the 3mm wood on the outer edges almost like a cut line. Also giving me ridges on the right hand side of the engrave as seen easier in the pictures of the squares and I think on the lettering also. Any advice would be greatly appreciated. Thanks.


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