We're seeing many questions about this! YouTube & YouTube Gaming subscriptions are merging, so videos from channels you're subbed to in Gaming will now show in your main subs feed: https://goo.gl/zfgfC4 If you think you’re seeing something else, please send a feedback report!https://twitter.com/FNecroShade/status/976850532626321411 …
Try these steps: delete the app > restart your device > reinstall the app. Let us know if that clears things up.