Last year I bought a gamecube controller adapter for the Wii U on the chance if I bought Smash Wii U...I never did and I never used the adapter.
I plugged the adapter into my switch dock and my c-sticks were constantly causing the option to change to a different selection.
Needless to say I figured that maybe it was the Wavebird OG wireless controller I bought in 2005 to replace my older ones. So I put the dock on my computer to try to play Wind Waker GC version on dolphin. I am running around Outset Island and I am constantly turning into "free camera" mode and jumping off of shit.
SO...I figured it was just my controller which was like 13 years old and stored and abused for the amount of time. SO I ordered a Switch SSB Gamecube controller, just to find out that this controller does the same thing. It turned out to be the ADAPTER. NOW I have to buy a new one.
I am not saying that this one being faulty is resulting in EVERY one being faulty. But I did read reviews and there are alot of 4,3,2, and 1 reviews.
I have read good things about the Mayflash and Official Nintendo adapter so I would recommend them:
In the attachments is a picture of the item I purchased and never used until Tuesday this week.