Why is Player 1 Start button acting like Player 2 start = YOU ARE NOT IN MODE 1

Just as the title says, move the switch on the back to the position closest to the serial cable (or yellow wire on the switch itself). The newest Tri-Mode USB controllers have the sticker labeled 1-4 (instead of a serial number) as shown below. Then test it.

Source article: <https://support.xgaming.com/support/solutions/articles/12000003142-why-is-player-1-start-button-acting-like-player-2-start-you-are-not-in-mode-1>