Don't worry if your sub count has drastically gone down!
This is a bug on YouTube.
@TeamYouTube already knows about the issue and are working on a solution.
Some channels have got their sub counters working again.
Don't worry if your count is still wrong. Mine still says 1 

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Gotta love @TeamYouTube
Just as I post that tweet, my sub count is fixed.
Thanks to the team at YouTube for fixing this issue!
- As I say, don't worry if your count is still very very wrong. It will be fixed soon!
YouTube is on it
pic.twitter.com/9zDNpl7l33
3:53 AM - 27 Nov 2018
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