Thanks for reaching out. It's normal to see fluctuation in subs count as YT performs regular checks and removes the spam account from your subscriber count. Here's more info: https://yt.be/help/rXvt . Hope this helps clarify.
@TeamYouTube I had 89,900+ subscribers last week. But it keeps reducing everyday. Currently it’s 89,500. Why are you doing this to me ? 
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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