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You can view the raw joystick output with the jstest program. I would compare that with the output from the joy node, to determine whether the issue is with the joy node, or somewhere deeper.

If jstest does not show similar behavior, you have enough information to put together a detailed bug (and maybe even fix it, if you're feeling adventurous).

If jstest shows similar behavior, the issue could be the linux driver, some built-in functionality of the joystick, or a hardware issue with your joystick. If you have or can borrow a spare joystick, you can compare the two to see if they both exhibit the same behavior.