Logged in from another location

Hello,

I was playing on a multyplayer server but i get constantly kicked..

In the server do i see an error called: "you logged in from another location"
but i never did. and already changed my password. and reinstalled the game also i logged off an second account in the launcer. and i updated java and my nvidia drivers.

I cant find an solution for this bug only that im hacked... 

 

do you guys got any tips for me?