Spiders, Cave Spiders and Endermen Don't Have Coloured Glows

I was testing around with the glow effect when I made it so all enemies were in a team with a colour. I gave them a glow effect, and all of the mobs got the coloured glow, except for the endermen, spiders and cave spiders, who had a white glow. I tested this with just endermen, spiders and cave spiders, and sure enough they didn't have a coloured glow.

To get this to work, go on the redstone ready superflat world and spawn in an endermen, spider or cave spider, and any other monster to compare results. Type in chat "/scoreboard teams add Monster" and "/scoreboard teams join Monster @e[type=!Player]" then "/scoreboard teams option Monster color red" and finally "/effect @e[type=!Player] glowing 30". For all of the other mobs you spawned in, they should have a red glow. The endermen, spiders and cave spiders should have a white glow.