Nether mob drops

When killing Zombie Pigmen they do not drop nothing but exp. And Blazes only drop Blaze Rods but no GlowStone. And a lighting issue. My screen randomly gets so bright that I don't need torches to see in a area that's supposed to be dark and torches needed to see. And last issue I have ran into Nether Wart Blocks cannot be turned back into Nether Warts. Example a Gold Block going back into Gold Ingots. Keep up the great work Mojang : )