I do not get enemies

I was playing Minecraft very happy and waiting until nightfall to kill monsters

There was no monster on the outside and I had the difficulty in normal and difficult when I left the world and came in. I would go out the monsters but later no longer ... and if they appeared only a few up to 7 monsters appeared in a very large space .. and it happened to me in all the worlds change of launcher and it was not solved to me neither nor By the error I leave the plunderers and the vindicators that attack the villages.

please give me an answer to solve this

to enjoy the update thank you