This may be related to a recent YouTube Gaming subscription update, the full announcement is here: https://goo.gl/zfgfC4 . Let us know if this doesn't seem like your issue or if you're unfamiliar with YouTube Gaming.
Thanks @TeamYouTube so subbing me to people I'VE NEVER SEEN BEFORE! And half don't even speak english... If you're going to make me sub to people without me knowing the least you can do is choose the English ones. -_- #YouTube #thanksalotpic.twitter.com/4O953sHJTY
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