Table not saving data. Whats wrong?

Hello I am new to roblox engine and I am trying to make a inventory system, the players inventory is saved in a table and when I put a item in it it deletes some other items to, the Items are identified by the slot, but they keep getting deleted, so please help me. so what is wrong with my code?

Inventory System:

local Inventories = {}
local InventoryHandler = {}



function InventoryHandler:CreateInv(Player)
	local Inventory = {}
	Inventories[Player] = Inventory
	return Inventories[Player]
end

function InventoryHandler:AddItem(Player, ItemData)
	if not Inventories[Player] then
		Inventories[Player] = {}
	end
	if Player.ClassName == "Player" then
		local pInv = Inventories[Player]
		if #pInv < 500 then
			local slot = #pInv+1
			pInv[slot] = ItemData
			pInv[slot].Slot = slot
			--gui stuff===============
			local itemSlot = game.ReplicatedStorage.GuiTemp.ItemFrame
			local NewCopy = itemSlot:Clone()
			NewCopy.Parent = Player.PlayerGui:WaitForChild("MainGui"):WaitForChild("InvMain"):WaitForChild("Main"):WaitForChild("ScrollingFrame")
			NewCopy.ItemName.Text = pInv[slot].Name
			NewCopy.Slot.Value = slot
			--==============================
			return slot
		end
	elseif game.Players:FindFirstChild(Player.Parent.Name) then
		local rPlayer = game.Players:FindFirstChild(Player.Parent.Name)
		local pInv = Inventories[Player]
		if #pInv < 500 then
			local slot = #pInv+1
			pInv[slot] = ItemData
			pInv[slot].Slot = slot
			--gui stuff===============
			local itemSlot = game.ReplicatedStorage.GuiTemp.ItemFrame
			local NewCopy = itemSlot:Clone()
			NewCopy.Parent = rPlayer:WaitForChild("PlayerGui"):WaitForChild("MainGui"):WaitForChild("InvMain"):WaitForChild("Main"):WaitForChild("ScrollingFrame")
			NewCopy.ItemName.Text = pInv[slot].Name
			NewCopy.Slot.Value = slot
			--==============================
			return slot
		end
	else
		print("Can't Find Player.")
	end
end

function InventoryHandler.getItem(Player, Slot, get)
	if not Inventories[Player] then
		InventoryHandler:CreateInv(Player)
	end
	local pInv = Inventories[Player]
	if pInv[Slot] then
		if get == "Name" then
			return pInv[Slot].Name
		elseif get == "Physical" then
			return pInv[Slot].Physical
		elseif get == "SpellPower" then
			return pInv[Slot].SpellPower
		elseif get == "LevelReq" then
			return pInv[Slot].LevelReq
		elseif get == "Upgrades" then
			return pInv[Slot].Upgrades
		elseif get == "MaxUpgrades" then
			return pInv[Slot].MaxUpgrades
		elseif get == "SellGold" then
			return pInv[Slot].SellGold
		elseif get == "Health" then
			if pInv[Slot].Health then
				return pInv[Slot].Health
			else
				return nil
			end
		elseif get == "Rarity" then
			return pInv[Slot].Rarity
		end
	end
end


function InventoryHandler:DeleteInventory(Player)
	if Inventories[Player] then
		Inventories[Player] = nil
	end
end

function InventoryHandler:GetNextSlot(Player)
	if not Inventories[Player] then
		InventoryHandler:CreateInv(Player)
	end
	local pInv = Inventories[Player]
	return #pInv+1
end

function InventoryHandler:CheckSlots(Player)
	if not Inventories[Player] then
		InventoryHandler:CreateInv(Player)
	end
	local pInv = Inventories[Player]
	return #pInv
end

return InventoryHandler

When they join:

local InventoryHandler = require(script.Parent.InvSystem)

local Players = game:GetService("Players")

Players.PlayerAdded:Connect(function(player)
	--Items===================
	local WoodSword = {
		["Slot"] = 0,
		["Name"] = "Wood Sword",
		["Class"] = "weapon",
		["Physical"] = 10,
		["SpellPower"] = 1,
		["LevelReq"] = 1,
		["Upgrades"] = 0,
		["MaxUpgrades"] = 10,
		["SellGold"] = 100,
		["Rarity"] = "Common"
	}
	local BeginnerWand = {
		["Slot"] = 0,
		["Name"] = "Beginner Wand",
		["Class"] = "weapon",
		["Physical"] = 1,
		["SpellPower"] = 10,
		["LevelReq"] = 1,
		["Upgrades"] = 0,
		["MaxUpgrades"] = 10,
		["SellGold"] = 100,
		["Rarity"] = "Common"
	}
	
	--========================
	--creates the inventory
	InventoryHandler:CreateInv(player)
	InventoryHandler:AddItem(player, WoodSword)
	InventoryHandler:AddItem(player, BeginnerWand)
	--=================
end)


Players.PlayerRemoving:Connect(function(player)
	InventoryHandler:DeleteInventory(player)
end)

When touching a certain block give item script:

local InventoryHandler = require(game:GetService("ServerScriptService").InvSystem)
local gave = false

local WoodSword = {
	["Name"] = "Wood Sword",
	["Class"] = "weapon",
	["Physical"] = 10,
	["SpellPower"] = 1,
	["LevelReq"] = 1,
	["Upgrades"] = 0,
	["MaxUpgrades"] = 10,
	["SellGold"] = 100,
	["Rarity"] = "Common"
}


script.Parent.Touched:Connect(function(player)
	if gave == false then
		gave = true
		InventoryHandler:AddItem(player, WoodSword)
	end
end)

script.Parent.TouchEnded:Connect(function(player)
	gave = false
end)

Thank You!