Skin from Player head dosen´t load

Some player heads showing Steve Skin and not the player skin. 

For example: ( /give @p minecraft:player_head{SkullOwner:Schokoladeee} ), ( /give @p minecraft:player_head{SkullOwner:Klavondroros} )

When setting this heads on the head of an armor_stand the armorstand cause hard lags.