21 degree player rotation is similar/equal in visual to 180 degree player rotation, why???

The script does the following:

We start at 0 degrees rotation (i.e: character's y-axis rotation is at 0 at the beginning)

1. Player on mobile device

2. Player dragging their finger (touch) to the right

3. While player is doing that, add 1 degree rotations as long as player's character's y rotation is not >= 180 degrees

Scroll down to [HERE] to see the script in question. Also, all scripts can be tested in studio (they are local scripts). Can I get any input as to what's happening here?

This is what a 180 degree rotation looks like in a test:

https://i.imgur.com/44LTv75.png

This is what that script looks like:

wait(.5)
local userInputService = game:GetService("UserInputService")
local localPlayer = game.Players.LocalPlayer
localPlayer.Character.Humanoid.WalkSpeed = 0
--// START:
wait(10)
localPlayer.Character:SetPrimaryPartCFrame(localPlayer.Character.HumanoidRootPart.CFrame * CFrame.Angles(0, math.rad(180), 0))
print("180 degrees rotation applied.")

[HERE] Now this is the actual script that leads to a similar visual effect relatively, but why??? It should go to 180 degrees and then not be able to rotate anymore.

https://i.imgur.com/MlJC71x.png

Local script:

wait(.5)
local userInputService = game:GetService("UserInputService")
local localPlayer = game.Players.LocalPlayer
localPlayer.Character.Humanoid.WalkSpeed = 0
--// START:
local touching = false
userInputService.TouchStarted:Connect(function(touch)
    touching = true
end)

userInputService.TouchEnded:Connect(function(touch)
    touching = false
end)

local yRotation = 0
userInputService.TouchMoved:Connect(function(touch)
    local originalXPos = touch.Position.X - touch.Delta.X
    local newXPos = touch.Position.X

    if (touching) then
        if (newXPos > originalXPos) then -- If we're dragging our touch gesture to the right, do this:
            if (yRotation < 180) then -- If we're not at 180 degrees yet, allow the rotations to keep incrementing.
                localPlayer.Character:SetPrimaryPartCFrame(localPlayer.Character.HumanoidRootPart.CFrame * CFrame.Angles(0, math.rad(yRotation), 0))
                yRotation = yRotation + 1 -- Increment rotation by 1 degree.
                print(yRotation) -- Output.
            end
        else
            -- Just do nothing if we're dragging to the left.                    
        end
    end
end)