Why does the Ray shoot straight when my mouse is pointing at the sky?

local IgnoreList={C,Gun}
	
local MouseLook=Mouse.Hit*CFrame.new(math.random(-1,1),math.random(-1,1),math.random(-1,1))	
	
local Ray=Ray.new(Fire.CFrame.p,(MouseLook.p - Fire.CFrame.p).unit*400)
	
local part,position = game.Workspace:FindPartOnRayWithIgnoreList(Ray,IgnoreList)

Thank you for answering if you did!