Heads up, Creators: On Dec 13-14 you may see a noticeable decrease in your sub count as we remove spam subscriptions. If spam is removed, you'll see a YouTube Studio alert: https://goo.gl/qGDBvX This should help give you confidence that the subs you do have are real fans!
You may see like/dislike counts change as some may be marked invalid and periodically removed. The number of likes/dislikes in YouTube Analytics may be different than what you see on the watch page under the video. Hope this helps clarify things for you!