[Skeeterweazel]

Thought i'd ask on the off chance someone had an idea about this.
A friend has a CNC Master Supra mill that is about 8 years old. I'm helping him do some small model train related projects. I'm a newb w/ CNC; am learning as i go.
I've found on numerous occasions where the Z moves down when it shouldn't. It seems to happen when it encounters a G02 or G03. I'm guessing it's some kind of glitch in the controlling software. I haven't done a lot of troubleshooting, but i have written a manual G02 and it didn't do it.
Using Fusion 360 for CAD & CAM, and a post processor i found on a forum.
Here is a sample of code. It's part of an adaptive clearing sequence.
Thx for any advice you might have.
Marty

N6360 G01 X-13.043 Y-3.902
N6365 G01 X-13.092
N6370 G03 X-13.14 Y-3.951 I0.002 J-0.05 F15
N6375 G01 X-13.145 Y-4.248
N6380 G03 X-13.091 Y-4.298 I0.05 J-0.001
N6385 G01 X-13.045 Y-4.293 F7.34
N6390 G01 X-13.039 Y-4.292

[Skeeterweazel]

After posting this i noticed a previous post w/ same question a few months ago. I didn't know how to delete this one.
Sorry.