Done Help please I think I've been hacked

I think Ives been hacked because every time I login I missing something in my chest are somethings destroyed on my island I think it was bye a guy who's ign is _Casperplays because whenever I login and something happens he seems to be involved with it
Ex)when I long on all my pcbs are gone and he thanks me for the pcbs when I wasent on for a couple days and he started 2 days ago
Another thing is when I login he has permission to my is when I never trusted him and every time a layer from my smeltery is gone and somehow he's able to pickup items on my is when I got on he was apparently trust if a staff see's this please help and respond

 

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