Concerned, as I am not sure if it's mods or texture packs (not texture for I checked there first) but Iron Chests mod, the chests keep vanishing and turning. I have noted this happens when well I am teleported back to bed from death. There is just an outline shape of the chest and as soon right-click they reappear, sometimes turned in a new position, mostly facing north (plus I have a tool from another mod that can turn blocks around).
It's not just Iron Chests but also to Noppes Varied Commodities mod too. Which I am reporting this to Noppes too.
I use only BDcraft resource on Minecraft (which is an awesome community). They do not know and said to just report it here.
I am dealing with it as I play even though annoying at times. So I thought I should report this bug/oddity?

Sorry if being annoying!