Armor inventory glitch when viewing inventory in single player

When browsing the inventory to view something, unoccupied armor slots go dark grey/black and do not have the armor symbols on them.

What I expected was for the armor slots to be light grey and have the symbols

What actually appeared was a black/dark grey color over took the slots

Steps to Reproduce:
1. Open inventory by hitting e
2. Move mouse in the inventory except at the armor slots