2016 deluxe, w7
This bug has been around since before v7.
When setting up a new paper space the page setup is changed to inches. I am only working in metric, have never used inches. Space units and every other setting I can find are set to metric.
To make matters worse this bug overflows into other settings, such as multiplying all the dimension settings by 25.4.
Since it takes 50 mouse/keyboard clicks/strokes to set up a page to print, this extra problem is most annoying.