Dawn Mod? Password change?

Well i was on tonite just me and a guy named Dawn is a mod. I loged in and he was next to me in lumbridge lv 3. then i log out. 30 mins later i come back and hes lv 126 with gold crown. he says he helps the owner with another project about rs2 servers but his names not on the staff list which is kinda fishy cuz he has a gold crown next to his name. then I laged out and it says my username or pass is invalid after talking to him. i logged into my second account "swoodc"and i asked him if he changed my pass and he loggs off. then i lagged out again and my password is invalid on swoodc as well...

Can som1 tell me who he is and change my password back please? because only both of us were online.

Weird... I never heard of Dawn.