While playing as an Arsonist, in a game with multiple transporters, there was a glitch that had lead to me - incorrectly assuming - that there was more than one Arsonist in the game.
It seems that when a transporter swaps you with your target, and you are dousing them, you are notified that you had been doused.
...Twice.
https://i.imgur.com/WP5GsKU.png
Unfortunately, it's difficult to recreate in-game due to the unexpected ways that things happen - and I failed to secure a screenshot of the role list after the game had ended.
Dummy me.
In my rush to come to the forums for the - ahem.
First time.
...I didn't think about how you might benefit from knowing all the roles, exactly, in that specific game that had been played.
I'm also not a frequent forum-user, so I may take longer than I should to reply, if any extra information be necessary.
Web Browser version, if that's any importance.
The only thing that I'm positive about is that I was the only Arsonist in-game - and I was lead to believe that arsonists had majority - which promptly made me jump at the chance to report an issue.