Hi. So basically, I someone post here on the forums, and nobody replied to it..
I copied, and pasted everything below, because the same thing is happening to me.
I'm playing Super Smash Bros. Brawl in Wii Mode on my WiiU, and I'm using a Classic Controller. I'm noticing that, right from the main menu, my controller bugs out every now and again; basically, I press right, and it registers that I pressed right twice instantaneously. I play the game, and I realize that it does this seemingly at random with any button I press - the controller responds fine enough, but usually when I jump, the game has me double-jump immediately, which tends to be detrimental to gameplay. Further, oftentimes when I attempt to run, my character will run for a couple steps, stop dead in their tracks as if I slammed on the brakes, try to run again, and repeat the process.
I then try playing with a different Classic Controller; same thing. I've tried the Wii Remote itself on other games, both disc and digital, and it seems to work fine. The Classic Controllers worked just fine on my original Wii console the last I used them a month ago.