Have you tried restarting your pc? If that doesn't work, I would try using reinstalling Twitch and directly using any uninstall option it comes with rather than going through the Control Panel.
Dual monitor setup with two different sized monitors. 27" and 22". Monitor 1 is the 22", but Windows is displaying it as the same size as my 27". How do I shrink it down to proportion here without changing the resolution??