Need help for dragging knob GUI

Help and Feedback Scripting Support
#1

I scripted with a knob dragging GUI, but the knob follows the cursor without clicking. Once I clicked, it releases a knob and it redo it again. So, look for an example video:

There is an example of a local script:

local frame = gui:WaitForChild("Frame")
local remoteReference = gui:WaitForChild("RemoteEventReference")

local eyeControl = frame:WaitForChild("EyeControl")
local eyeMain = eyeControl:WaitForChild("EyeMain")
local knob = eyeMain:WaitForChild("Knob")

local remote = nil
local faceModel = nil

local grabbed = false

local function calculateKnobPosition(inputPosition)
	local XDiff = inputPosition.X - eyeMain.AbsolutePosition.X
	local XRatio = math.min(math.max(XDiff / eyeMain.AbsoluteSize.X, 0), 1)
	
	local YDiff = inputPosition.Y - eyeMain.AbsolutePosition.Y
	local YRatio = math.min(math.max(XDiff / eyeMain.AbsoluteSize.Y, 0), 1)
	
	return XRatio, YRatio
end

local function moveKnob(XRatio, YRatio)
	local knobXScale = knob.Size.X.Scale / 2
	local knobXOffset = knob.Size.X.Offset / 2
	local knobYScale = knob.Size.Y.Scale / 2
	local knobYOffset = knob.Size.Y.Offset / 2
	knob.Position = UDim2.new(XRatio - knobXScale, -knobXOffset, YRatio - knobYScale, -knobYOffset)
end

local function mouseHeld(input)
	if input.UserInputType == Enum.UserInputType.MouseButton1 or Enum.UserInputType.Touch then
		grabbed = true
	end
end

local function mouseReleased(input, gameProcessed)
	if input.UserInputType == Enum.UserInputType.MouseButton1 or Enum.UserInputType.Touch then
		grabbed = false
	end
end

local function mouseMoved(input, gameProcessed)
	if grabbed == true then
		if input.UserInputType == Enum.UserInputType.MouseMovement or Enum.UserInputType.Touch then
			local XRatio, YRatio = calculateKnobPosition(input.Position)
			moveKnob(XRatio, YRatio)
			remote:FireServer("RepositionEyes", faceModel, (XRatio - 0.5) * 2, (YRatio - 0.5) * 2)
		end
	end
end

local function onRemote(func, funcFaceModel, ...)
	if funcFaceModel == faceModel then
		if func == "GUIReposition" then
			moveKnob(...)
			initialPositionRecived = true
		end
		if func == "RequestCloseGUI" then
			CloseGui()
		end
	end
end

knob.InputBegan:Connect(mouseHeld)
userInputService.InputEnded:Connect(mouseReleased)
userInputService.InputChanged:Connect(mouseMoved)

I also scripted with an UserInputService instance for making a dragging knob. So, how do I fix it?

#2 
local function mouseReleased(input, gameProcessed)
        UserInputService.InputEnded:Connect(function()
	       grabbed = false
        end)
end