Similar to issue # 140 (#140), and possibly others, Mythic Metals Decorations double chests cause a visual issue in the terminal where it shows twice the number of items in the network.
Pulling them from the terminal give you the correct number of items.
Single chests from the same mod do not cause this glitch.

Tested on a dedicated server instance separate from the client.

I saw the config file has a line for "multiblockInv", which I think might apply, but I'm not sure how to use it.

https://github.com/Noaaan/MythicMetalsDecorations

Also reported on Mythic Metals Decorations:
Noaaan/MythicMetalsDecorations#19