No, i didn't do that. Its a glitch in the game. When it happens, sometimes relogs will bring it back, but if it doesn't come back, it never will. It may be a miscalculation in the database, and when the server d/cs it messes with the player IDs. So someone else might have your stuff :/
It used to happen to me when I ran my own server, but I can't be too sure.