Rhino6 Mac

I was trying to use BoxEdit to move Some clipping Planes to a desired Z coordinate.

I’m not understanding why a Clipping plane laying on the XY plane, so with Z=0 elevation is showed in the BoxEdit panel with Z position not equal to zero.

For Example if the CP is drawn with X size = 100 mm, Y= 100 mm I get Z size = 50 (half X an Y sizes) and Z position = -25 mm (negative half of Z size)

What I’m doing wrong?

I find this a bit misleading since it should be a plane (therefore with a zero dimension in the 3rd axe).

clipping-BoxEdit.3dm (2.8 MB)