Which postprocessor are you using? Did you try the latest version from the github page? The last commit on that one is “fix arc movements” But not exactly clear what the changes do.
However, what does happen in the cnc file you posted every arc movement is a G2 clockwise arc, while some of them should be a G3 counterclockwise movement. So in stead of making a very short arc in the counterclockwise direction it’s making a very large one in the clockwise direction. Hence, the circles you see.
I haven’t looked at the documentation of vcarve and/or their postprocessor files but don’t see anything obviously wrong with the file on Github. GitHub - Snapmaker/snapmaker_cnc_post_process
So make sure that’s the version you’re running.
If you still have that problem: report an issue on the github page detailing this problem: Issues · Snapmaker/snapmaker_cnc_post_process · GitHub
In essence, what seems to be happening is that all arc moves seem to be converted to clockwise moves (G2) while some should be counter clockwise (G3).
Make sure you provide them with the necessary files to be able to reproduce that issue.
This file has it fixedV-Carve 3-2_fixed.cnc (61.4 KB) But you would also need to have the file before the postprocessing for them to easily understand where it goes wrong.
But first; try the last version of the postprocessor on github to make sure it’s still a problem