i am banned on 10 or more servers for no reason

[Skillz]

i play normally and then i get kicked and when i open server list i see i am banned..for no reason..i've never used hack or something..other guys told me its says 'speed hacking' but i never used it..i think its because a fast stairs movement..when i am moving up on stairs i use jump button to go with more speed and thats why i am banned i think..what should i do? :/