Items Disappearing from chests/shulker boxes

I keep having thus issue where items will disappear from a chest or shulker box, after quitting a world, I haven't seen anyone else affected by this, it seems to happen at random, as I cannot make it happen, lost 3+ stacks of Emerald blocks from a shulker box

 

What I expected

Leaving my world with items in chest/box to return later with them still there

 

What happened

I reenter the world to find the items have disappeared and are nowhere to be seen

 

How to reproduce

1.put items into chest/shulker box

2.save and quit world

3.log back into world

4.items may be gone

 

This is happening on a solely single player world, so it's not a case of someone taking them, I can't seem to replicate it when I want to, so I cannot add screenshots, this was not something I experienced before the 1.7 update