Sup Guy's
We are running a tekkit server wich has 2 Admins, me and my brother.
Tonight 2 people joined on our server first with some username, then they relogged 3x times and then somehow had the username "ADMIN1" and "Admin2" (Example)
They had all rights we have, our inventorys, they gave themself god mode, gamemode and nuked our hole spawn and our own bases.
Our server.log http://pastebin.com/V2J8Q1ja
(I changed our nicknames to ADMIN1 and ADMIN2)
How is this possible? How could they fake the usernames and use the same rights as we have?