You’ve lost some items due to an SSC data error. Some people have lost their whole inventories:
I presume that Survival has been a pretty laggy dimension recently, and this was probably the culprit of this SSC data error.
On a side note, I’ve once lost a lot of items and gained a lot of new ones in Survival. It turns out, that day, two conspirators found out my password and logged-into my account , distributing my items amongst themselves and others.