Some of the posting here are due to the design of the game.
Some others it sounds like their stuff just vanished.
I myself was a victim of items just vanishing… caused by some bug/issue on their end. I reached out to Blizzard and asked for some help.
They didn’t help me. Here is a link to what they did say and has many many other deleted data cases linked to it.
Sorry for your losses. Until they implement a better system… you play at your own risk.
Stay warm out there travelers.