Hmm, this is new information. This is likely a CNC calibration of movement issue.
Which model CNC are you using? I may have the machine defaults available as a reference:
Here’s the X-Carve since that is the most common one in this forum: X-Carve default GRBL Settings $$ Values – His N Hers Handcrafted
OR IF you like, you can perform a manual calibration like this: (make sure to do all 3 axis’s)
