Twitter unfollows. Error or accident? Forced unfollow?

[Suemmy]

I just cleaned my twitter account. There are a lot of retweeters who actually never retweet me and a lot of individuals who did not follow back so here it is the problem:

I sent a tweet to GYNTK (Girls You Need To Know) - and I just realised I do not even follow them. However I did and I definitely did not unfollow. And disappeared. Maybe they kicked me out?

How?

And how many people did I unfollow by mistake? Do you know anything about it?
Please if I unfollow you do not take serious... I do not do it Just tell me to follow you again..

I signed up for socialoomph for scheduled tweets - but they are not supposed to work like this.

Thank you for help