Steam: wiimote recognized as three controllers

When I connect a Wiimote via Bluetooth, Steam detects it as three separate devices.

All of the inputs are duplicated - pressing a button on one controller results in presses being registered on all of them. How can I fix it?

I see you have most likely not read anything here according to your profile, did you have a look here Wiimote - ArchWiki or here XWiimote - ArchWiki ?