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Joy-Con Control Sticks Are Not Responding or Respond Incorrectly

What to do
With the Joy-Con controllers attached to the console, verify that they register correctly as attached within the Controllers screen, accessible from the HOME Menu.
If the Joy-Con controllers are not registering correctly on the console, please read Joy-Con Not Recognised or Not Registering While Attached to the Console.
Ensure your console has the latest system update.
Ensure the Joy-Con controllers have the latest controller firmware installed.
Remove any skins or covers, if any, from the problematic controllers, and calibrate the control sticks.
If the issue is occurring with a specific game or application, try the following:
Check for any available software updates for that game.
Check the electronic manual for that game. Some games, such as Mario Kart 8 Deluxe, support in-game tilt controls. If these are activated, it may seem as if the control sticks are not responding correctly. If this is the case, the in-game tilt controls may need to be deactivated.