Cutting on Borders Bug

If I place an object right on the border of the grid, i.e. 600,0 , then the parts of the object ON the border do not cut. There is no table slop warning. So I change to 599.99, .01 and no problem. Seems that there should be a warning. Pertinent info: Ruida controller, Win 7. I had moved laser head by clicking out of bounds then Move To Laser Position in attempt to get as far to Upper Left as possible.