at y 92 regular mobs(zombies, creeper, etc) can spawn in the end

I was making an enderman farm but is see that creeper, zombie, etc. Was spawning on the spawning area. This platform was at 92 high on the Y axe and more than 128 blocks of the obsidian platform.

An other bug is that endearment doesn't want to kill the end ermite in the minecartin the middle of the picture.

Thanks for answering.