Melee, controller holds down and the c stick freaks out

[DankLinks]

I'm experiencing a similar problem. I think he has his adapter set to WiiU mode on the adapter for the instant response time and rumble. However (to my knowledge) you aren't able to adjust anything. My controller appears to constantly lightly be pressing the left trigger. (When I'm playing melee I'm perma shielding, but when I play Windwaker I'm able to hold down left trigger to target stuff) (as well as z not working entirely). I've plugged the controller into a wii and had no problems. I've tried re-installing the drivers, but I'm not sure what to do. If there's a fix I'd be really grateful. Thanks.