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. If the control sticks cannot be calibrated, the non-working Joy-Con controller(s) will need to be repaired. Please contact us