Whose controller is it anyway?

Whose controller is it anyway?

Two identical USB controllers connected; one player controls movement of both players.

Steps to reproduce:

  1. Connect two identical USB controllers.
  2. Perform in-game Controller Setup with both.
  3. Test inputs of both controllers in menus and game.

Expected Results:
One controller controls P1’s character and menus; the other P2’s.

Actual Results:
One controller controls only P1(P2)'s character and menus as usual; the other controls P2(P1)'s character and menus in addition to P1(P2)'s movement in game and menus. When there is only one menu, the latter controller’s inputs are counted double.

Game Version:

System Information:
Windows 10 64-Bit
2x iNNEXT SNES USB Controller