When I add Joystick.sliderLeft(analogRead(x)) the button don't work anymore

[meilleur102]

I have a problem when I add a Joystick.
I have a potentiometer plug into one Input and I have 3.3V and ground plugged on the other 2 connector of the potentiometer.
When I write in the code (anywhere). I try to hard code the value and still the button don't work

Joystick.sliderLeft(analogRead(x));

The slider work but the button don't work anymore.
I have 2 rotary encoder that work perfectly when I remove this part of the code.

Here's my loop (the function for the CheckEncoder and ReadMatrix work when the Joystick.SliderLeft is commented

void loop() {  
  // put your main code here, to run repeatedly:
  isBtnPress = false;
  
  CheckAllEncoders();
  ReadMatrix();
  if(isBtnPress == true){
    ActivateBtns();
    }
  Joystick.sliderLeft(50);
}

EDIT:

I just realise that even when the slider is not in the code when I first open the Game Controller I have the 2 slider at 50% and as soon as I press a button (rotary Encoder) the slider go back to 0

BEFORE PRESSING A BUTTON

AFTER PRESSING A BUTTON