Why doesn't my data store actually save the data?

Alright so pretty much only one weapon saves and I'm not sure why. I've tried having multiple data stores so it would work but nothing happens and it still shows up as 0. You don't have to read the whole thing just know that the ones that don't work are the M1911, AWP and more but I forgot but still what's the matter or is there a more efficient way since my game will have a lot of different weapons.

local DataStore = game:GetService("DataStoreService"):GetDataStore("PlayerWeaponStats")

game.Players.PlayerAdded:connect(function(player)
	
	local key = "user-" .. player.userId
	
	local store = DataStore:GetAsync(key)
		
		--AK-12
		player.Class.WeaponStats["AK-12"].Kills.Value = store[1]
		player.Class.WeaponStats["AK-12"].Headshots.Value = store[2]
		player.Class.WeaponStats["AK-12"].BTs.Value = store[3]
		player.Class.WeaponStats["AK-12"].DKs.Value = store[4]
		player.Class.WeaponStats["AK-12"].LS.Value = store[5]

		--FAMAS
		player.Class.WeaponStats["FAMAS"].Kills.Value = store[6]
		player.Class.WeaponStats["FAMAS"].Headshots.Value = store[7]
		player.Class.WeaponStats["FAMAS"].BTs.Value = store[8]
		player.Class.WeaponStats["FAMAS"].DKs.Value = store[9]
		player.Class.WeaponStats["FAMAS"].LS.Value = store[10]
		
		--AS VAL
		player.Class.WeaponStats["AS VAL"].Kills.Value = store[11]
		player.Class.WeaponStats["AS VAL"].Headshots.Value = store[12]
		player.Class.WeaponStats["AS VAL"].BTs.Value = store[13]
		player.Class.WeaponStats["AS VAL"].DKs.Value = store[14]
		player.Class.WeaponStats["AS VAL"].LS.Value = store[15]
		
		--MK11
		player.Class.WeaponStats["MK11"].Kills.Value = store[16]
		player.Class.WeaponStats["MK11"].Headshots.Value = store[17]
		player.Class.WeaponStats["MK11"].BTs.Value = store[18]
		player.Class.WeaponStats["MK11"].DKs.Value = store[19]
		player.Class.WeaponStats["MK11"].LS.Value = store[20]

		--UMP45
		player.Class.WeaponStats["UMP45"].Kills.Value = store[21]
		player.Class.WeaponStats["UMP45"].Headshots.Value = store[22]
		player.Class.WeaponStats["UMP45"].BTs.Value = store[23]
		player.Class.WeaponStats["UMP45"].DKs.Value = store[24]
		player.Class.WeaponStats["UMP45"].LS.Value = store[25]
		
		--MP7
		player.Class.WeaponStats["MP7"].Kills.Value = store[26]
		player.Class.WeaponStats["MP7"].Headshots.Value = store[27]
		player.Class.WeaponStats["MP7"].BTs.Value = store[28]
		player.Class.WeaponStats["MP7"].DKs.Value = store[29]
		player.Class.WeaponStats["MP7"].LS.Value = store[30]
		
		--KSG 12
		player.Class.WeaponStats["KSG 12"].Kills.Value = store[31]
		player.Class.WeaponStats["KSG 12"].Headshots.Value = store[32]
		player.Class.WeaponStats["KSG 12"].BTs.Value = store[33]
		player.Class.WeaponStats["KSG 12"].DKs.Value = store[34]
		player.Class.WeaponStats["KSG 12"].LS.Value = store[35]
		
		local items = {

				player.Class.WeaponStats["AK-12"].Kills.Value;
				player.Class.WeaponStats["AK-12"].Headshots.Value;
				player.Class.WeaponStats["AK-12"].BTs.Value;
				player.Class.WeaponStats["AK-12"].DKs.Value;
				player.Class.WeaponStats["AK-12"].LS.Value;

				player.Class.WeaponStats["FAMAS"].Kills.Value;
				player.Class.WeaponStats["FAMAS"].Headshots.Value;
				player.Class.WeaponStats["FAMAS"].BTs.Value;
				player.Class.WeaponStats["FAMAS"].DKs.Value;
				player.Class.WeaponStats["FAMAS"].LS.Value;
				
				player.Class.WeaponStats["AS VAL"].Kills.Value;
				player.Class.WeaponStats["AS VAL"].Headshots.Value;
				player.Class.WeaponStats["AS VAL"].BTs.Value;
				player.Class.WeaponStats["AS VAL"].DKs.Value;
				player.Class.WeaponStats["AS VAL"].LS.Value;

				player.Class.WeaponStats["MK11"].Kills.Value;
				player.Class.WeaponStats["MK11"].Headshots.Value;
				player.Class.WeaponStats["MK11"].BTs.Value;
				player.Class.WeaponStats["MK11"].DKs.Value;
				player.Class.WeaponStats["MK11"].LS.Value;
				
				player.Class.WeaponStats["UMP45"].Kills.Value;
				player.Class.WeaponStats["UMP45"].Headshots.Value;
				player.Class.WeaponStats["UMP45"].BTs.Value;
				player.Class.WeaponStats["UMP45"].DKs.Value;
				player.Class.WeaponStats["UMP45"].LS.Value;

				player.Class.WeaponStats["KSG 12"].Kills.Value;
				player.Class.WeaponStats["KSG 12"].Headshots.Value;
				player.Class.WeaponStats["KSG 12"].BTs.Value;
				player.Class.WeaponStats["KSG 12"].DKs.Value;
				player.Class.WeaponStats["KSG 12"].LS.Value;
				}

				
		DataStore:SetAsync(key, items)
end)

game.Players.PlayerRemoving:Connect(function(player)
	
	local items = {

				player.Class.WeaponStats["AK-12"].Kills.Value;
				player.Class.WeaponStats["AK-12"].Headshots.Value;
				player.Class.WeaponStats["AK-12"].BTs.Value;
				player.Class.WeaponStats["AK-12"].DKs.Value;
				player.Class.WeaponStats["AK-12"].LS.Value;

				player.Class.WeaponStats["FAMAS"].Kills.Value;
				player.Class.WeaponStats["FAMAS"].Headshots.Value;
				player.Class.WeaponStats["FAMAS"].BTs.Value;
				player.Class.WeaponStats["FAMAS"].DKs.Value;
				player.Class.WeaponStats["FAMAS"].LS.Value;
				
				player.Class.WeaponStats["AS VAL"].Kills.Value;
				player.Class.WeaponStats["AS VAL"].Headshots.Value;
				player.Class.WeaponStats["AS VAL"].BTs.Value;
				player.Class.WeaponStats["AS VAL"].DKs.Value;
				player.Class.WeaponStats["AS VAL"].LS.Value;

				player.Class.WeaponStats["MK11"].Kills.Value;
				player.Class.WeaponStats["MK11"].Headshots.Value;
				player.Class.WeaponStats["MK11"].BTs.Value;
				player.Class.WeaponStats["MK11"].DKs.Value;
				player.Class.WeaponStats["MK11"].LS.Value;
				
				player.Class.WeaponStats["UMP45"].Kills.Value;
				player.Class.WeaponStats["UMP45"].Headshots.Value;
				player.Class.WeaponStats["UMP45"].BTs.Value;
				player.Class.WeaponStats["UMP45"].DKs.Value;
				player.Class.WeaponStats["UMP45"].LS.Value;

				player.Class.WeaponStats["KSG 12"].Kills.Value;
				player.Class.WeaponStats["KSG 12"].Headshots.Value;
				player.Class.WeaponStats["KSG 12"].BTs.Value;
				player.Class.WeaponStats["KSG 12"].DKs.Value;
				player.Class.WeaponStats["KSG 12"].LS.Value;
				}

	local key = "user-" .. player.userId
	
	DataStore:SetAsync(key, items)
	
end)

Their is more it's just I had to remove some.