Why is the torso not staying aligned?

Alright, so what's happening is I'm working on a third person camera system, but I am have a lot of trouble here with the torso. It works fine when you test, right up until you walk into a wall or something. The torso will rotate and it gets stuck there. I have been trying to find a solution for the past 2 days and nothing has come out of it. To test, just make a local script and paste code in there.

repeat wait() until game.Players.LocalPlayer.Character
--// Variables
local player = game.Players.LocalPlayer
local char = player.Character
local valueFolder = char:WaitForChild('Values')
local mouse = player:GetMouse()

local humanoid = char:WaitForChild("Humanoid")
local rootPart = char:WaitForChild("HumanoidRootPart")
humanoid.AutoRotate = false

local switched = false;

--// Tables
local control = 
{
    cam = workspace.CurrentCamera;
    camOffset = Vector3.new(2, 2, 8);
    cameraAngleX = 0;
    cameraAngleY = 0;

    xDelta = valueFolder:WaitForChild('xDelta');
    yDelta = valueFolder:WaitForChild('yDelta');
}

--// Services
local ContextActionService = game:GetService("ContextActionService")
local uis = game:GetService("UserInputService")
local RunService = game:GetService("RunService")
local ts = game:GetService('TweenService')

--// Functions
local function playerInput(inputObject)
    control.cameraAngleX = control.cameraAngleX - inputObject.Delta.X
    -- Reduce vertical mouse/touch sensitivity and clamp vertical axis
    control.cameraAngleY = math.clamp(control.cameraAngleY-inputObject.Delta.Y*0.4, -75, 75)
    -- Rotate root part CFrame by X delta
    --inputObject.Delta.X
    rootPart.CFrame = rootPart.CFrame * CFrame.Angles(0, math.rad(-inputObject.Delta.X), 0)
end

local function focusControl(inputObject)
    uis.MouseBehavior = Enum.MouseBehavior.LockCenter
    uis.MouseIconEnabled = false
end

--// Inputs
uis.InputBegan:connect(function(input,chat)
    if not chat then
        if input.UserInputType == Enum.UserInputType.MouseButton1 then
            focusControl(input)
        end;

        if input.KeyCode == Enum.KeyCode.V then
            switched = not switched

            if not switched then
                control.camOffset = Vector3.new(2, 2, 8)
            else
                control.camOffset = Vector3.new(-2, 2, 8)
            end;
        end;
    end
end)

uis.InputChanged:connect(function(input,chat)
    if not chat then
        if input.UserInputType == Enum.UserInputType.MouseMovement then
            playerInput(input)
        end;
    end
end)

--// Renders
RunService.RenderStepped:Connect(function()
    if control.cam.CameraType ~= Enum.CameraType.Scriptable then
        control.cam.CameraType = Enum.CameraType.Scriptable
    end
    local startCFrame = CFrame.new((rootPart.CFrame.Position)) * CFrame.Angles(0, math.rad(control.cameraAngleX), 0) * CFrame.Angles(math.rad(control.cameraAngleY), 0, 0)
    local cameraCFrame = startCFrame:ToWorldSpace(CFrame.new(control.camOffset.X, control.camOffset.Y, control.camOffset.Z))
    local cameraFocus = startCFrame:ToWorldSpace(CFrame.new(control.camOffset.X, control.camOffset.Y, -10000))
    control.cam.CFrame = CFrame.new(cameraCFrame.Position, cameraFocus.Position)

    local newNeck = char:WaitForChild('Torso'):WaitForChild('Neck')
    local HRPCF =  char:WaitForChild("HumanoidRootPart").CFrame * CFrame.new(0, 1.5, 0) * CFrame.new(char:WaitForChild("Humanoid").CameraOffset)
    newNeck.C0 = newNeck.C0:lerp(char:WaitForChild("HumanoidRootPart").CFrame:toObjectSpace(HRPCF) * CFrame.Angles(math.asin((mouse.Hit.p - mouse.Origin.p).unit.y),0,0),0.2)
    newNeck.C1 = newNeck.C1:lerp(CFrame.new(), 0.2)
end)