Left Joystick sends "down" data; 3D detecter "inversed"/broken?

Hi,

I have a problem with my Switch Pro Controller.

Left Joystick is sending the data “Down”.

But, I opened my controller as far as I could, and seems to be an issue on the “rotation detecters”, inversed/broken; or the motherboard is broken ?

Here’s my internal joystick.

I suppose the blue-green piece at right is for up/down motion

And on the bottom, this is for left/right motion

BUT

The piece at right seems to be unusable

AND

The strangest thing, it’s when there is “contact” on the bottom piece (which should control Left/Right motion, not Up/Down) that I have the “Down” data sent.

Look at the photo : it’s when I put this little circle piece that I have the issue.

When I fill it in, BOUM, it sends the Down data.

I don’t know what to do.

Change just the blue-green piece ?

I don’t understand how it’s possible to have this issue.

Maybe my motherboard or the connections are broken ?

Here is a picture :

Thanks for reading