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)