Armour on armour stands despawning

Had armor on stands. Came back from mining to find 2 gone.

Was building another section looked in window an saw armor stand vanish leaving armor on floor. But by time I got to door an into room armor was gone as well.

There is an upload Pic of room out there

I don't know what is meant by "affects version" but I'm on Xbox series x. With I'm assuming it's "bedrock edition"