All of my rare stuff got wipe out from "My Stuff" while i was gone for a month

[OGHalo]

So I been gone for the past month or more, so today I finally came back on today and I realize that my credits went down to 2 million, so I check and see if my very rare stuff is still there, and nope my 200 Director Chair that I pay for is gone, billions of credits gone, thrones, black and silver pillows, eggs, DJ's, typewritters and more that i save up since 2012 gone.

I don't know what had happen during that month while I was gone but I would like some answers explaining the reason and situation, thanks.

Edit: idk if your system change or I straight up got hacked, I did have to change my password