{Sorry if this is in the wrong section!}

I was on as my character, Aldrik, when I spotted a stag that had the exact symbol as me. He was moving around and such, and he didn't seem happy... o_o

I thought it wasn't a glitch, so just to be safe, I exit the game and came back. It took me a while to get on because I kept getting 'Error' when my internet connection was perfectly fine.

So when I finally connect to the game...

My antlers, my pelt and my mask were gone. It took me forever to get everything on him. ><;

Basically, I am asking if this is a hacker? Or maybe a glitch of some sort? Because this happened to my friend, too.