Thanks for reaching out! This may be related to a recent YouTube Gaming subscription update: https://goo.gl/zfgfC4 . If these aren't gaming channels, let us know.
@TeamYouTube It may sound weird, but did you guys do something wrong applying an backup? Several channels I have been subscribed to years ago, but then unsubscribed due to lack of interest, just reappeared in my subscription feed.
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