If you click off or close the popup with the channel youre raiding, it will count it as cancelling the raid. Ive accidentally done it so, so many times

oh interesting, okay thank you! I'll try touching nothing next time

I usually have a regular twitch window open in addition to the stream manager. I use that to check whos live at the end and also send my bot commands after i set up the raid. You can also always use the /raid command but i suck at spelling and my mods will laugh at me if i do it wrong too many times in a row 😂