Twitter deleting followers glitch?

What I've noticed after account lock/unlock followers are starting to decrease in big amounts…

Example:

Acc. with 47.398 followers was locked for 6 hours. After unlocking there are 47.310 followers. 2 hours later – 47.304 followers…

Same happens to other accounts – up to HUNDREDS of deleted followers.

I've googled it – no answer… What to do???