Undo Print?? Why?

[Soundgarden]

I have a PSD file that I modify a Smart Object in multiple times. After each modify/edit of the SO, I print a copy of the image purposely - then undo my SO change, modify it again, and print a new modified copy. I noticed that if I hit CTRL-Z to undo my SO modify - it does nothing? I have to hit CTRL-Z twice to get the SO undo. I then notice that Photoshop is trying to undo my print with my first CTRL_Z?? What? and Why?

(and the "Undo Print" is an option 10 mins later if I leave the image alone after printing it, go to the printer to get my printed image, and hold printed image in my hand.)

[Soundgarden]

and if anyone is wondering, it cannot "Undo Print," the image leaves Adobe's realm once you send it to print, so even the undo option is misleading.