[2021] Random names appeared in admin list

We just started playing this awesome game with some friends. Last night i was hosting the game (Steam option selected only, password protected with no so easy password and no one we don't know joined from what we have seen only us three . I remember seeing a real short green bar in the middle of the screen couple of times (thought connection issue) but have not seen any map downloads/new user in map etc.). Today while starting hosting the game i was going to add their account names to the admin list and voila! there were two names i don't know added already next to my account name "big k" and "kovarex".

Could this be a known bug etc. ? Since one of the names was kovarex??? and we were three and there were 3 names in the list.
Can people somehow add themselves as admin after joining my game ? Lua commands was limited to admins only , should i worry about anything ? Thanks a lot for replies.