zombie,spidar,cave spider,wolf... do not affected by "potion of weakness"

zombie,spider,cave spider, wolf, and any mob can hurt player don't affected by "Potion of weakness" (without skeletons and zombie pigman becuse they use weapons)

"what i was expected" : the mobs (like zombis and spiders and...) will can't hurt me

"what really happened" : mobs (like zombis and spider and...) still can hurt me
(all screenshots I add , its for mobs splash with "potion of weakness" without other potion (only zombies which splash with "Potion of Fire Resistance"))

samsung galaxy s4
4.4.2 (kitkat)