I’ve tried using !nightbot leave, using the button on nightbot’s controls, and even disabling my account but it still won’t leave my chat.
I have the same problem too.
I disconnect Nightbot in the Twitch-Settings, I logged Nightbot out on Dashboard from the Channel, I revoke the Mod-Rights from Nightbot and banned him from my Channel but he won’t leave.
Is it responding? If not, then it is not in your channel.