Mach3 not machining to scale

[Ellie]

Mach3 not following Gcode drawing to scale. Gcode made in Aspire 8.5.
Cutter should have travelled 500mm but only moved 20mm.
Manually jogging the correct distances as displayed on mach3 but when Gcode is loaded it machines 1/20th the scale drawing. Scale is set to 1. Can anyone advise what I'm doing wrong?

[ger21]

Probably an issue with inch/metric.
Make sure Config > Native Units is set correctly, and make sure the g-code is in the same units.