I use 3 monitor setup with GTX1070 (primary not for gaming)

Game started on Monitor #3 (right one). When get access to options menu (when the game starts, after trailers, why not before?)
set the monitor to #2... Then it appears on #1 (left one). Tried to switch to #1, game kept on left monitor. Any changes in the monitor
selection, game shown on #1.

Workaround for it: Switch to windowed mode, move the window to desired monitor, press alt-enter for back to fullscreen.

btw, at the first moment, nice pantomime show why PC dressing her wounds (no bandage).