It's normal to see fluctuation in subs count as YT performs regular checks and removes the spam account from your subscriber count: https://goo.gl/vaHoKS . Hope this helps clarify.
@TeamYouTube 4 subs were removed from my channel at the same time on the same day in the same secondpic.twitter.com/Gm3QFyTI35
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The subs where removed after the spam remove
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