Hi, Fred
Post the dxf file we'll look at it, May just be a setting in Mach3 like a g90.1 or g91.1 IJ's in abs inc mode set incorrect or XY XZ plane setting.
You need preamble setting's in the top of your G code to configure Mach to the "Proper State" to run/display the Code properly.
Put a G91.1 in the top of your G code, Look's good hear, Try the att. G code file.
Chip