haha. happened on my account too. about 200 which is around 8% of follower counts.
I think twitter is cracking down on fake accounts, or accounts that violates twitter rules, i.e. tweet a lot.
So don't worry. It will go up again
200 is quite a lot, but it could be their account was just getting restricted & suspended, and they maybe unfollowing you just because they're not a crypto lovers or not interested in crypto things. So much people getting suspended nowadays, because joining twitter bounty.