I experienced the same problem and am very happy to see that I can actually turn off this behaviour (the Menu option name was rather misleading for me so I did not find it).

I checked the behaviour but for me also at existing jobs the default setting for auto rescale is turned on, which is very annoying indeed. Maybe this is the same problem as for the size and position of the Input window (I keep on resizing en repos the window, actual state is never saved).