Recently my laser starts to cut twice (retrace?) when I am sure it is just one simple hairline shape such as a circle. I use Illustrator 2018 to make the shape, and then open Lightburn to import the ai file. I have a Chinese CO2 100W machine. I don’t think I had this problem before until recently. I don’t think I updates any software.
Can anyone help what could be the problem? Thx