I found this strange bug in my single player world where if you place down a Player Head the outer pixels of the head come off.  It turns upside down when  facing south.  But weirdly enough looks fine when facing north.  If facing east or west it will turn to the right.  I have screen shots of the different angles I have placed the Player Head and how it is affected.  They are below! 

You can recreate this by typing in this command:

"/give @p minecraft:Player_Head{SkullOwner:YourNameHere} 1" and then placing it on a wall. (like a tree, as I did in the screenshots below)

I find it pretty weird and I hope this gets fixed!

Here is some  info to go along side the screenshots

The first screenshot is of what it looks like when placed facing south.

The second screenshot is of what it looks like when placed facing north.

The third screenshot is me standing next to the head shown in screenshot 1.

The fourth screenshot is of what it looks like when placed east or west.

Hope this helped!