All chests that are placed before the 0.7.4 update contains the dark texture as if a block has placed above it, while placing a chest on 0.7.4 contains the normal texture.

Pictures:
Picture 1: The left chest is the bugged (Placed on 0.7.3}, and the right chest appears normal (Placed on 0.7.4)
Picture 2: More bugged chests

This bug can be solved in-game, but it could happen again on the next version.