Why does rotating this model, cause CFrame script to act up?

Hello! I am working on a game that includes this model (once clicked makes two parts rotate on the Y axis) and an object placement script. The object placement script is the one made by tunicus at this link.

Here's an example of the "acting up" that I'm talking about.

Also, if it helps at all, the cranks that work perfectly fine are rotated to 0 on the Y axis. And the ones that are acting up are rotated to either 90 or -90 on the Y axis.

Here's the script as of now.

wait()

local tycoon = _G.findFirstParent(script, "Tycoon")

local post = script.Parent.Post
local handle = script.Parent.Handle
local crank = script.Parent.Crank
local cd = script.Parent.ClickDetector

local postPos = post.Position
local handlePos = handle.Position
local crankPos = crank.Position

local handleOff = Vector3.new(handlePos.X - postPos.X, handlePos.Y - postPos.Y, handlePos.Z - postPos.Z)
local crankOff = Vector3.new(crankPos.X - postPos.X, crankPos.Y - postPos.Y, crankPos.Z - postPos.Z)

local startingCrank = crank.Rotation.Y

local TIME = 1 -- seconds
local POWER = 1
local FRAMES = TIME * 30
local TURN = 360 / FRAMES
local CRANK_COLOR = crank.Color 

local timeForCombo = 0
local combo = 1

local isTurning = false

function turn ()
	if not isTurning then
		if timeForCombo > 0 then
			combo = combo * 1.1
		end
		
		TIME = 1 / combo
		FRAMES = TIME * 30
		
		if FRAMES < 15 then
			FRAMES = 15
			crank.Color = Color3.fromRGB(255, 0, 0)
		end		
		
		TURN = 360 / FRAMES
		
		isTurning = true
		for i = 1, FRAMES do
			crank.CFrame = CFrame.new(postPos) * CFrame.Angles(0, math.rad(i*TURN), 0) * CFrame.new(crankOff.X, crankOff.Y, crankOff.Z)
			handle.CFrame = CFrame.new(postPos) * CFrame.Angles(0, math.rad(i*TURN), 0) * CFrame.new(handleOff.X, handleOff.Y, handleOff.Z)
			handle.Rotation = Vector3.new(handle.Rotation.X, handle.Rotation.Y, 90)
			wait()
		end

		local i = 0	
		crank.CFrame = CFrame.new(postPos) * CFrame.Angles(0, math.rad(i*TURN), 0) * CFrame.new(crankOff.X, crankOff.Y, crankOff.Z)
		handle.CFrame = CFrame.new(postPos) * CFrame.Angles(0, math.rad(i*TURN), 0) * CFrame.new(handleOff.X, handleOff.Y, handleOff.Z)
		handle.Rotation = Vector3.new(handle.Rotation.X, handle.Rotation.Y, 90)		
		
		--tycoon.Power.GeneratePower:Fire(1)
		timeForCombo = 1
		isTurning = false
	end
end

cd.MouseClick:connect(function ()
	turn()
end)

while wait(0.1) do
	timeForCombo = timeForCombo - 0.1
	if timeForCombo < 0 then
		timeForCombo = 0
		combo = 1
		crank.Color = CRANK_COLOR
	end
end