Hostile Mob Spawning Decreased

So in this snapshot seems to be fine, but 1 thing I notice when I play my Survival World or any type of Worlds, is that I don't see Hostile Mobs spawning that often when it turns to night time.
The screenshots you see below, is that no hostile mobs are spawning that often. And I did lock the Difficulty to Normal as a proof. However, they will spawn nearby your spawn area where you started when you create a new world, but the further away you go, they will spawn very slowly.
This also happens in Superflat World, where only Slimes seems to be fine to spawn in the day time, rather than other hostile mobs at night.

NOTE: They "do" spawn sometimes, but the further away I go from them (as of Superflat World and Default Worlds), they rarely spawn. In the last Snapshots they would spawn more normally, rather than little amount in this Snapshot.