Armor points don't add up

Armor point don't add up, only affect on custom item. 

Here's the command

give @p minecraft:chest{display:{Name:'{"text":"Wolf\'s spirit set","color":"blue","bold":true}'},BlockEntityTag:{Items:[{Slot:11b,id:"minecraft:iron_helmet",Count:1b,tag:{display:{Name:'{"text":"Wolf\'s spirit","color":"blue","bold":true}',Lore:['{"text":"Wolf\'s spirit strengthens your body.","color":"dark_gray","italic":true}','{"text":"Classes:Warrior","color":"gray"}','{"text":"Damage Rank:A","color":"gray"}','[{"text":"Defense Rank:","color":"gray"},{"text":"B","color":"gray","underlined":true}]','[{"text":"Speed Rank:","color":"gray"},{"text":"B","color":"gray","underlined":true}]']},HideFlags:5,RepairCost:999999,Unbreakable:1b,Damage:1,warrior:1b,rare:1b,Enchantments:[{id:"minecraft:unbreaking",lvl:1s}],AttributeModifiers:[{AttributeName:"generic.attack_damage",Name:"generic.attack_damage",Amount:2,Operation:0,UUID:[I;-565631823,800673533,-1549485527,-1384088556],Slot:"head"},{AttributeName:"generic.armor",Name:"generic.armor",Amount:4,Operation:0,UUID:[I;-704565669,-1936900034,-1126607331,-915100435],Slot:"head"}]}},{Slot:12b,id:"minecraft:iron_chestplate",Count:1b,tag:{display:{Name:'{"text":"Wolf\'s spirit","color":"blue","bold":true}',Lore:['{"text":"Wolf\'s spirit strengthens your body.","color":"dark_gray","italic":true}','{"text":"Classes:Warrior","color":"gray"}','{"text":"Damage Rank:A","color":"gray"}','[{"text":"Defense Rank:","color":"gray"},{"text":"B","color":"gray","underlined":true}]','[{"text":"Speed Rank:","color":"gray"},{"text":"B","color":"gray","underlined":true}]']},HideFlags:5,RepairCost:999999,Unbreakable:1b,Damage:1,wolfsspirit:1b,rare:1b,Enchantments:[{id:"minecraft:unbreaking",lvl:1s}],AttributeModifiers:[{AttributeName:"generic.attack_damage",Name:"generic.attack_damage",Amount:0.2,Operation:1,UUID:[I;-565631823,800673533,-1549485527,-1384088556],Slot:"chest"},{AttributeName:"generic.armor",Name:"generic.armor",Amount:4,Operation:0,UUID:[I;-704565669,-1936900034,-1126607331,-915100435],Slot:"chest"},{AttributeName:"generic.attack_speed",Name:"generic.attack_speed",Amount:0.1,Operation:1,UUID:[I;986495457,-631486070,-1308261292,1721938195],Slot:"chest"}]}},{Slot:14b,id:"minecraft:iron_leggings",Count:1b,tag:{display:{Name:'{"text":"Wolf\'s spirit","color":"blue","bold":true}',Lore:['{"text":"Wolf\'s spirit strengthens your body.","color":"dark_gray","italic":true}','{"text":"Classes:Warrior","color":"gray"}','{"text":"Damage Rank:A","color":"gray"}','[{"text":"Defense Rank:","color":"gray"},{"text":"B","color":"gray","underlined":true}]','[{"text":"Speed Rank:","color":"gray"},{"text":"B","color":"gray","underlined":true}]']},HideFlags:5,RepairCost:999999,Unbreakable:1b,Damage:1,warrior:1b,rare:1b,Enchantments:[{id:"minecraft:unbreaking",lvl:1s}],AttributeModifiers:[{AttributeName:"generic.attack_damage",Name:"generic.attack_damage",Amount:0.2,Operation:1,UUID:[I;-565631823,800673533,-1549485527,-1384088556],Slot:"legs"},{AttributeName:"generic.armor",Name:"generic.armor",Amount:4,Operation:0,UUID:[I;-704565669,-1936900034,-1126607331,-915100435],Slot:"legs"},{AttributeName:"generic.attack_speed",Name:"generic.attack_speed",Amount:0.05,Operation:0,UUID:[I;-335633305,1945783495,-1087117803,-220045305],Slot:"legs"}]}},{Slot:15b,id:"minecraft:iron_boots",Count:1b,tag:{display:{Name:'{"text":"Wolf\'s spirit","color":"blue","bold":true}',Lore:['{"text":"Wolf\'s spirit strengthens your body.","color":"dark_gray","italic":true}','{"text":"Classes:Warrior","color":"gray"}','{"text":"Damage Rank:A","color":"gray"}','[{"text":"Defense Rank:","color":"gray"},{"text":"B","color":"gray","underlined":true}]','[{"text":"Speed Rank:","color":"gray"},{"text":"B","color":"gray","underlined":true}]']},HideFlags:5,RepairCost:999999,Unbreakable:1b,Damage:1,warrior:1b,rare:1b,Enchantments:[{id:"minecraft:unbreaking",lvl:1s}],AttributeModifiers:[{AttributeName:"generic.attack_damage",Name:"generic.attack_damage",Amount:0.2,Operation:1,UUID:[I;-565631823,800673533,-1549485527,-1384088556],Slot:"feet"},{AttributeName:"generic.armor",Name:"generic.armor",Amount:4,Operation:0,UUID:[I;-704565669,-1936900034,-1126607331,-915100435],Slot:"feet"},{AttributeName:"generic.attack_speed",Name:"generic.attack_speed",Amount:0.05,Operation:1,UUID:[I;-2032738971,-410630823,-1505053166,-171851210],Slot:"feet"}]}}]}} 1