Items not equipping in custom inventory system?

Im trying to make an inventory system, a drag inventory system, yet i found something strange. It works perfectly in Studio, yet when i hop onto Roblox, the items dont' equip. Why? I don't know.

This is the "Flawed Script"

--//Services
local Players = game:GetService("Players")
local UIS = game:GetService("UserInputService")
local RS = game:GetService("ReplicatedStorage")

--//Events
local UpdateAncestory = RS:WaitForChild('UpdateAncestory')

--//Objects
local Slots = { script.Parent:WaitForChild('One'), 
				script.Parent:WaitForChild('Two'),
				script.Parent:WaitForChild('Three'),
				script.Parent:WaitForChild('Four'),
				script.Parent:WaitForChild('Five'),
				script.Parent:WaitForChild('Six'),
				script.Parent:WaitForChild('Seven'),
				script.Parent:WaitForChild('Eight')}

--//PlayerObjects
--in code...

local Backpack = Players.LocalPlayer:WaitForChild('Backpack', math.huge)

--//Functions
function Dequip(Char)
	for i, v in ipairs(Slots) do
		v.Equipped.Value = false
		v.BackgroundColor3 = Color3.fromRGB(0,0,0)
		if Char:FindFirstChildOfClass('Tool') then
			Char:FindFirstChildOfClass('Tool'):Destroy()
		end
	end
end

--//Code
UIS.InputBegan:connect(function(input)
	local Char = Players.LocalPlayer.Character
	local Humanoid = Char:WaitForChild('Humanoid')
	
	if script.Parent:FindFirstChild(input.KeyCode.Name) then
		local SlotEquip = script.Parent[input.KeyCode.Name]
		if SlotEquip.Equipped.Value == false and SlotEquip.Tool.Value ~= nil then
			Dequip(Char)
			SlotEquip.Equipped.Value = true
			SlotEquip.BackgroundColor3 = Color3.fromRGB(255, 255, 0)
			if SlotEquip.Tool.Value ~= nil then Humanoid:EquipTool(SlotEquip.Tool.Value:Clone()) end
		elseif SlotEquip.Equipped.Value == true and SlotEquip.Tool.Value ~= nil then
			Dequip(Char)
		end
	end
end)

Dear Qu4n7um7, This isn't really an answer but if you'd like I could help you with this in roblox because i have a setup very similar to this and you could have it if you'd like, Just message my user (in order to do so please click three dots and follow then refresh page) and i'll get back to you with an answer.