Refined Relocation 2.1.18
Minecraft 1.10.2

So when placing down Refined Relocation Chests, they have a weird black rendering. Hard to explain, look at that picture: http://i.imgur.com/FERRv8O.png

If you need more info, let me know.

Are you using any mods that mess with rendering, such as OptiFine?

No Optifine, no specific mods that mess with rendering that I know of.