There is a problem with player's attack power

Attack on a Skeleton(Creeper,Villager and so on) with 20 health points by hand,I need to hit 10 times to kill it,But to kill a Zombie（Husk,Drowned,Zombified Piglin）with 20 health points,I need to hit 20 times?

This means that for other creatures, I do 2 damage per attack,but for Zombies, there is only 1 damage