Pretty sure that's not how you wear these things... 😅

Steps to Reproduce:

Step 1: Go into any world

Step 2: Take any Mob Skull or Carved Pumpkin

Step 3: Put on the Mob Skull or Carved Pumpkin

Observed Results:

The object is worn like footwear, despite displaying in the Helmet slot.

Expected Results:

The object should be worn as headwear, and therefore render in the same fashion as helmets.

On a side note, this doesn't affect Helmets or Turtle Shells, only Mob Skulls and Carved Pumpkins. And yes, this can happen on any world, texture pack or not.