It could have to do with how you post arcs versus how Mach makes them.
In Mach3, go to the config> General Config> and look for the IJ mode. Change it from absolute to incremental or vice versa and regen the tool path.
If that doesn't change it, then I'd need to see the G code and the geometry you're trying to cut.
Royce
That worked!! Thank you very much Royce!!
I was freaking out lol
Did you switch it from incremental to absolute or the other way?
Royce
Is this due to the axes not being homed properly?