Hello:

My home made router was unused for a month and last night I turned it on for an urgent profiling work. But circle in my design profiled a strange shape! Please see the picture attached. I've also attached Mach3 config and the Gcode.
Everything was working as expected before and I can't really remember I modified anything in Mach3 by this time.

Kind suggest me the fix.

Thank you.

That's not a problem in Mach3.  Your machine has a large amount of backlash in the X axis....

Regards,
Ray L.