HACKERR!!!!!!!!!!!!!!!

SOMEONE HAX MY SERVER ON MY WESIDE OF SERVER IT SAYS IS OFFLINE BUT I CAN JOIN IT AND I SEE ON IT ONE PLAYER NAME: SER2224

IS SO WEIRD IS BAN ME AND I TRY UNBAN ON CONSOLE ITS NOFING WEIRD PLS HELP IS HAX MY SERVER + I CANT START IT NOW PLS DO SOMETHING

THANKS

guys in my console it says to server is offline i try to start it and hacker is gone and no more weird things but i try to find that player name but i see to that player name It does not exist its like npc hax my server because i try on server to ask then something and is nofing say just ban me in 10 sec and try to join my server with other account i see to there are now 2 players but player number 2 It does not exist too so wierd motd is that &#%×€×*#;÷&@¥¥×&##_@€@€€×^× and one name i cant remember what name pls help thanks

I have picture of weird motd

i screenshot my server motd

i try to unban me when i start it im not more, so scary