How can I refresh my custom inventory gui?

How could I make my custom inventory GUI refresh its items whenever you pick up an item? I've tried using functions and running parts of the script again. However, that only duplicates the items instead of adding the item I picked up. I am unsure of how to do this. Help would be appreciated.

local player = game.Players.LocalPlayer
local character = player.Character
if not character or not character.Parent then
    character = player.CharacterAdded:wait()
end

local StoredItems = {}
local Source = script.Parent.Background.InventoryBack
local Button = game.ReplicatedStorage.Replicated.Slot:Clone()


for i, v in pairs(player.PlayerGui.Items:GetChildren()) do
		table.insert(StoredItems, v)

end

for i = 1,#StoredItems do
			Button = game.ReplicatedStorage.Replicated.Slot:Clone()
			Button.Name = (StoredItems[i]).Name
			Button.Image = (StoredItems[i]).Img.Image
			Button.Parent = Source.Inventory
			Button.MouseButton1Click:Connect(function()
	if not Source.Inventory.Selected.Value or not StoredItems[Source.Inventory.Selected.Value] then
		script.Parent.Background.Equipment.ItemName.Text = (StoredItems[i]).Name
		script.Parent.Background.Equipment.ItemImage.Image = (StoredItems[i]).Img.Image
		script.Parent.Background.Equipment.ItemDescription.Text = (StoredItems[i]).Description.Value
		Source.Inventory.Selected.Value = (StoredItems[i])
		if Source.Inventory.Selected.Value ~= Source.Inventory.Equipped.Value then
			Source.Inventory.Location.Value = (StoredItems[i]).Parent
			script.Parent.Background.Equipment.Equip.Text = "Equip"
		elseif Source.Inventory.Selected.Value == Source.Inventory.Equipped.Value then
			Source.Inventory.Location.Value = (StoredItems[i]).Parent
			script.Parent.Equipment.Equip.Text = "Unequip"
		end
	end
end)
end



local plr = game.Players.LocalPlayer
local mouse = plr:GetMouse()
local frame = script.Parent.Background
local key = "e"

mouse.KeyDown:connect(function(k)
	if k:lower() == key then
		if frame.Visible then
			frame.Visible = false
		else
			frame.Visible = true
		end
	end
end)