I have a feeling it's something to do with the "Twitch name" field in the general settings for the game, but no streams are coming up (though they are on twitch itself). I wonder if it's related to this game having name conflicts.

Game is Curiosity, the twitch 'category' is curiosity-1, and the IGDB url has curiosity--2. I've tried all three values in the twitch name field but nothing shows up on the speedrun streams page.

I browsed around, and many games have no streams listed, but not always, so I wonder if this is frequently misconfigured.

It's to do with the Twitch category's name, not URL.

Here you'd set the "Twitch name" to be "Curiosity".

Then there's something else broken because that does not work. There are other games with the same name that were listed on IGDB so it may be causing issues.