mobs created for 1.14.4 in 2019.5 have superpowers not assigned

I've created mobs that have no special abilities.  They are fairly plain in functionality and not particularly difficult (from a player's perspective) as they do not have excessive health points, are not armored and do not deal large amounts of damage.  

I have also created armor twice as tough as diamond with maximum protection (by MCreator).

When testing in game, these not so powerful mobs kill players armored in the "twice as tough as diamond" armor in one hit, even though the mobs are only assigned to deal out 3 points of damage.

The game says "player was killed by magic" each time.

As stated above, these mobs have no special abilities and are not in any way overpowered.

What is going on?

Thanks in advance,

M