webmidi: noteoff events not being fired.

I have the following code;

midiDevice.addListener('noteon', (e) => {
    console.log("on")
    let data = normalizeMidi(e.note.number, sharp)
    start(data)
});
midiDevice.addListener('noteoff', (e) => {
    console.log("off")
    let data =  normalizeMidi(e.note.number, sharp)
    stop(data)
});

When I press a note button on my midi keyboard noteon is triggered when i release the button noteoff isn’t. I know this because nothing is showing up in the console for off but on is fired twice.