What's causing my magic beam and projectile aim to go wacky when it doesnt hit a base part?

Ill only include beam code here, since the projectile script is pretty similar.

Hierarchy: StarterPack --> Tool --> LocalScript(Main) --> RemoteEvent(Function) --> Script(Handle) --> Bunch of particles

Here in the LocalScript(Main), I'm getting a userinput and on E press, I pass the mouse.hit.p to the remoteevent

game:GetService("UserInputService").InputBegan:Connect(function(input)
if input.KeyCode == Enum.KeyCode.E and equipped == true and eCoolDown == false and isTyping == false and mainCoolDown == false then
		local BG = Instance.new("BodyGyro", humanoidRootPart)
		BG.maxTorque = Vector3.new(250000, 250000, 250000)
		BG.P = 6000
		BG.D = 150
		
		local BP = Instance.new("BodyPosition", humanoidRootPart)
		BP.MaxForce = Vector3.new(math.huge, math.huge, math.huge)
		local pos = humanoidRootPart.Position
		BP.P = 6000
		BP.D = 150
		
		script.Function:FireServer("KeyDown", "E")
		keydown = true
		local timer = 45
		while keydown and timer > 0 do
			BP.Position = pos
			BG.CFrame = CFrame.new(humanoidRootPart.Position, mouse.hit.p)
			timer = timer - 1
			wait()
		end
		local firePosition = mouse.hit.p
		wait(0.3)
		
		spawn(function() 
			wait(1.2)
			BP:Destroy()
			BG:Destroy() 
		end)
		script.Function:FireServer("KeyReleased", "E", firePosition)
		mainCoolDown = true
		spawn(function() wait(1.3) mainCoolDown = false end)
		eCoolDown = true
		wait(2)
		eCoolDown = false
	end
end)

Script(Handle) receives and creates the laser beam

keydown = false
mousePosition = nil
RegMod = require(game.ReplicatedStorage.RegionModule)
onCooldown = false

script.Parent.OnServerEvent:Connect(function(player, command, ability, LastMousePosition)
	local c = player.Character or player.CharacterAdded:wait()
	
	if command == "KeyReleased" then
		keydown = false
		mousePosition = LastMousePosition
	end
	
	if command == "KeyDown" then
		keydown = true
		while keydown do
			wait(0.03)
		end
if ability == "E" then
			local Beam = Instance.new("Part", game.Workspace.Beams)
			Beam.Shape = "Cylinder"
			Beam.BrickColor = BrickColor.new("Bright orange")
			Beam.Material = "Neon"
			Beam.Transparency = 0.1
			Beam.CanCollide = false
			Beam.Anchored = true
			Beam.CFrame = c.HumanoidRootPart.CFrame 
			Beam.CFrame = CFrame.new(c.HumanoidRootPart.Position, mousePosition) * CFrame.Angles(math.rad(0),math.rad(-90),math.rad(0))
			Beam.CFrame = Beam.CFrame * CFrame.new(-2.5,1.5,0)
			Beam.Size = Vector3.new(0.1,0.1,0.1)
			
			local ignore = {c, workspace.Beams, workspace.FX, workspace.Junk, workspace.Projectiles}
			local RayStart = c.HumanoidRootPart.Position
			local RayEnd = mousePosition
			local Length = 200
			local FireRay = Ray.new(RayStart, (RayEnd-RayStart).unit*Length)
			local HitPart,BeamPosition = game.Workspace:FindPartOnRayWithIgnoreList(FireRay, ignore)

			print(CFrame.new(c.HumanoidRootPart.Position, BeamPosition))
			print(CFrame.new(c.HumanoidRootPart.Position, mousePosition))
			print(CFrame.new(c.HumanoidRootPart.Position, Beam.CFrame.Position)) 
			--These all print the same thing, so I think the error has to do with where mouse.hit.p actually is
			
			local BeamLength = Instance.new("NumberValue", Beam)
			BeamLength.Name = "BeamLength"
			BeamLength.Value = (BeamPosition - c.HumanoidRootPart.Position).magnitude
			
			--Rest of the script just registers damage and effects
	end
end)

https://gyazo.com/3e11885d71c3dedde63aadaf73b4fa5f

Especially in the second cast, you can see the error. Any help would be appreciated :^)