Missing items!!!

Random things keep on disappearing, and it's driving me crazy!!! I thought it was just me for a while but things have been disappearing out of my chests or current inventory! The latest was a stack or two of emeralds that I had ready to trade. Another was Copy of an Oceanic Monument map that I had in a chest in a village. Before that was random items diamond items like a pick axe. I really don't remember before that.. Please fix!!! I'm trying to complete the achievements and it's hard when the game is working against me. please get back to me. Thank You...

-Mike