Why Instagram followers dropped suddenly?

People could unfollow others for various reasons. One of the most popular reasons for the drop of followers is people unfollowing you.

Instagram tries to keep the service clean by deleting spam accounts. If many spam accounts were following you then your account might experience a sudden drop in followers.

Some inactive accounts might be considered Spam accounts by Instagram and so they might get deleted as well.

Most services that sell followers provide people with fake accounts that are very likely to be deleted when Instagram initiates a clean up. See why Instagram is popular.

Many accounts unfollow people if they didn't follow them back. If you didn't follow back a large number of people then your follower count might drop. See why Instagram is bad for your mental health.

An offensive post , such as a racist post, could motivate many people to unfollow you at once.

Instagram once announced that a bug resulted in increasing follower count and that the follower count will be reduced once again after the bug is fixed.

Purchased followers might affect the quality of the social network and as a result the Instagram team might try to delete them even if they seemed like real accounts.