Thanks for letting us know. The subscriptions you see represents the combination of Gaming app and YouTube subscriptions. To confirm, do you see the videos from those channels in your subs feed? If yes, share yours as well as the URLs of the channels. Keep us posted.
While there isn't any such option to opt out, but you can always use our 'Send Feedback' tool to submit your thoughts, here's how: https://yt.be/help/ghA5 . You may not get a direct response, but we do review all the info and use it to prioritize requests. Thanks.