wearing a piece of armor in inventory, make other slots dark

wear a piece of armor, and the other armor slots go dark

What i expected to happen was, that when i took headgear(iron) the other slots didn't go darky

What really happened was the slots DID go black (see images below)

1. craft a armor piece (headgear, feet..
2. open inventory and place the armor, in the armor slot.
3. other slots go dark.
3.5. mouse over and it disappear