(WTF?!)

I tried to join 'Irish Beatdown' server today, and this just happened.
who is banned me before? I didn't any cheat or spamming on there but why?

Actually I don't know when was I banned exactly because I was checked it today.
is there any idea how to solve it? and why should I was banned? Am I really doing something wrong before?(actually, I was busy these days and so I just played it again about couple days ago. fortunately, other servers are fine.)



P.S.

Sometimes, I was kicked by cheating&spamming even I don't have any cheat programs and never trying to do it.(in that case, other players were kicked as a same reason like me at the same time.) is it also one of reason?