We've seen a few similar reports and looking into it. A few people found that disabling third-party extensions fixed the issue, or they were logged out and just needed to switch back to the right account. Let us know if either of those things work for you.
@TeamYouTube Why does my subscriptions page look like this half the time? Also why are numerous channels I'm subscribed to not turning up on my subscription box. I'm not updated when they upload, and have to check their individual channels for new videos...pic.twitter.com/NLgwHJwmun
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