Gamepad started triggering keys i didn't set

while testing my game my gamepads directional started activating actions i set to my keyboard out of nowhere (for example i had set the “a” key on my keyboard to open a menu, but now everytime i hit left on my joystick it opened the menu) i found out that this happened to all of my projects. i ended up solving the issue but i just wanted to know if there was a reason why this happened all of a sudden because the joystick never triggered these actions b4. could this have been caused by an update or something?