NES second gamepad is not polled correctly
first of all, AWESOME IDE.
as by my own code and also your "Controllers" example, i am getting unreliable data from game controllers. this only happens when two USB gamepads are connected. can you reproduce?
PS i am a patreon
PS Edge browser on Windows 10
Hmm.. Do your gamepads work together on a browser test? Here's one: https://hardwaretester.com/gamepad
It might be worth trying on the dev build: https://sehugg.github.io/8bitworkshop/
The IDE appears to only register 3 button presses at once.
There was a problem with multiple controllers interfering with each other, but it's fixed in the dev build. Not sure about the multiple button presses, it could be related to that.