ive been hacked?!

so just now, memory thief told me that i was griefing (which i wasn't) and i always play offline due to mineshafter isn't working properly (which i would TRY to fix later on) but theoretically speaking, i think someone hack me over the past 24 hours because i stop playing around 4:30 yesterday.and further more, i think he change my pass because of the "/register <passwordofchoice>" and due to the fact of increasing hackers and griefers in the server, there is a huge chance that the hacker could have multiple accounts and was past ban and used another account,in these case, my account.please understand that i wasnt the one who grief right about now.

i can change your password, tell me when you can come on, get in contact with me through steam if you have it, my name is thomas.legan co-owners have the power to change pws for you but you need to be online