Good day!
I have a Foxalien Masuter pro with extension to 4080 and had maybe related issues which may be caused by the same misunderstanding or whatever. I have only used it for laser cutting yet.
My topic was this in Lightburn forum: Foxalien GRBL wrong Coordinates
I works for me now for laser cutting but I tried Millmage now. The spindle is moving in the wrong direction when using the buttons in the move window. In my earlier topic someone said I should work with inverse coordinates in Lightburn but in Millmage it will be different (and easier to find the right setting?) I haven’t found a solution yet.
I hope I can learn with you.