Probably K1 and the joystick use the same CC#. You can verify in the MIDI monitor if what I say is the case. If yes, changing one would most likely solve it.
OS: Windows 11 Pro | HW: Gigabyte Z690-UD-DDR4 • INTEL i7 12700K • 64GB • 3x EVO 860 • NVIDIA GT1030 (@WQHD) • RME AIO