Help with Factorio like conveyor belt system?

I'm trying to make a conveyor belt like the ones in factorio. This is supposed to be the intended behaviour. This can be found in a roblox game: Manufactory

However this is my result of replicating the system: result

I have been playing around with my code to see if anything will change but none works. Here's my code:

-- movement of items from conveyor one to another
-- creates a new thread everytime a new conveyor is added
coroutine.resume(coroutine.create(function()
	local heartbeat
	local totalRun = 0
	local pointLooping = false
	local laneLooping = false
	heartbeat = game:GetService("RunService").Heartbeat:Connect(function(dt)
		if child and child:FindFirstChild("ItemsPerSecond") then
			local nodes = child.Nodes -- where the lane are [left, right]
			
			if not laneLooping then
				local start = tick()
				laneLooping = true
				for _, lane in pairs(nodes:GetChildren()) do -- loops all nodes in the lane
					pointLooping = true
					coroutine.resume(coroutine.create(function() -- is here to make sure all lanes are looping together
						for index = #lane:GetChildren(), 1, -1 do
							coroutine.resume(coroutine.create(function() -- is here to make sure all nodes are
								-- all nodes are attachments
								local currentNode = lane:FindFirstChild("Node"..index)
								local nextNode = lane:FindFirstChild("Node"..index - 1)
								if nextNode then
									if currentNode.Item.Value and nextNode.Item.Value == nil then
										-- move current item to next node
										tween(currentNode.Item.Value, {"Position"}, nextNode.WorldPosition, child.ItemsPerSecond.Value, Enum.EasingStyle.Linear, Enum.EasingDirection.Out)
										nextNode.Item.Value = currentNode.Item.Value
										currentNode.Item.Value = nil
									end
								else
									local nextConveyor = child.NextConveyor.Value -- aka the front conveyor
									if nextConveyor then
										local connectionType = getConveyorConnection(child, nextConveyor) -- check how the conveyor are connected to each other
										if connectionType == "Left" then
											if lane.Name == "Left" then
												nextNode = nextConveyor.Nodes.Left:FindFirstChild("Node1")
											else
												nextNode = nextConveyor.Nodes.Left:FindFirstChild("Node4")
											end
										elseif connectionType == "Right" then
											if lane.Name == "Right" then
												nextNode = nextConveyor.Nodes.Right:FindFirstChild("Node1")
											else
												nextNode = nextConveyor.Nodes.Right:FindFirstChild("Node4")
											end
										elseif connectionType == "Back" then
											nextNode = nextConveyor.Nodes:FindFirstChild(lane.Name):FindFirstChild("Node4")
										end
										
										if currentNode.Item.Value and nextNode.Item.Value == nil then
											-- move current item to next conveyor last node
											tween(currentNode.Item.Value, {"Position"}, nextNode.WorldPosition, child.ItemsPerSecond.Value, Enum.EasingStyle.Linear, Enum.EasingDirection.Out)
											nextNode.Item.Value = currentNode.Item.Value
											currentNode.Item.Value = nil
										end
									end
								end
							end))
						end
						pointLooping = false
					end))
				end
				repeat game:GetService("RunService").Heartbeat:Wait() until not pointLooping
				--print("TIME TAKEN: " .. tick() - start)
				laneLooping = false
			end
		end
	end)
end))

If there anything else that needs clarification feel free to ask! Thanks in advance for any help! :D