There are two attached files contains the same polysurface. in perspective window please try to mirror or create a cutting plane starting from Zero to X axis. in this end File which named “normal” does what rhino does for me since i learned it. but on the other file (different) mirroring the polysurface mirrors the model under the XY plane.
“move” comand also moves objects in Z direction rather than x and y directions while at Perspective viewport
What may cause this behaivour?