Why is MouseButton1Down malfunctioning?

I have a localscript that is in a TextButton. When i click anywhere , the effect is the same to clicking the button. Why does this happen? How can i fix it?script:

local ready = false
function onMouseButton1Down()
	ready = true
end
local sp = script.Parent
sp.MouseButton1Down:Connect(onMouseButton1Down())
repeat wait(0.1) until ready == true
if ready == true then
	local click = false
	local clone = game:GetService("ReplicatedStorage").Plane:Clone()
	local mouse = game.Players.LocalPlayer:GetMouse()
	local firstclick = false
	clone.Parent = workspace
	function invisible(model,scale)
		local c = model:GetChildren()
		for i= 1, #c do 
			if c[i].className ~= "Model" then 
				c[i].Transparency = scale
			else
				invisible(c[i],scale)
			end 
		end 
	end
	function anchor(model,bool)
		local c = model:GetChildren()
		for i= 1, #c do 
			if c[i].className == "Model" or c[i].className == "Folder" then 
				anchor(c[i],bool)
			else
				c[i].Anchored = bool
			end 
		end 
	end
	function collide(model,bool)
		local c = model:GetChildren()
		for i= 1, #c do 
			if c[i].className == "Model" or c[i].className == "Folder" then 
				collide(c[i],bool)
			else
				c[i].CanCollide = bool
			end 
		end 
	end
	anchor(clone,true)
	collide(clone,false)
	invisible(clone,0.6)
	mouse.Button1Down:connect(function()
		if firstclick == false then
			click = true
			firstclick = true
			invisible(clone,0.6)
		end
		while click == true do
			clone:MoveTo(mouse.Hit.Position)
			anchor(clone,true)
			wait(0.01)
		end
	end)
	mouse.Button1Up:connect(function()
		if click ~= false then
			click = false
			wait(0.02)
			collide(clone,true)
			anchor(clone,false)
			invisible(clone,0)
			clone.VehicleSeat.Main.Disabled = false --only for this item --
		end
	end)
end

On line 6 you're not supposed to have the parenthesis included for the argument of Connect().

Remove the parenthesis () after onMouseButton1Down in line 6.