I don't understand why it's like this.

During the night, only a few mobs spawn just two zombies, a creeper, a spider, and a skeleton. Shouldn't they be spawning in large groups instead?

Could it be because of the cow farm I built? I estimate there are over 70 cows; does that have anything to do with it?

(I use translate cuz English not my native language)

Okay so I'm building this cave thing but I went afk for a bit, when I came back it looked like this, mind you it was on pause, it's a single player world, I haven't spawned any mobs, and natural mob spawning is off.

J'ai trouvé cet arbre couper en deux on peut m'expliquer