[SOLVED BY ME] Position-tweening boat model keeps going below the skybox. How can i fix this?

-- Variables
local ts = game:GetService("TweenService")
local Destination = 1
local boat = script.Parent.Parent
-- Vector destinations
local placestogo = {Vector3.new(0.782, -7.5, -116.367), Vector3.new(35.282, -7.5, -82.117), Vector3.new(120.5, -7.5, -53.25)}
-- function to tween the boat
function tweenBoat(goal,thingToDo)
	if thingToDo == "turn" then
		local tweeninfo = TweenInfo.new(8,Enum.EasingStyle.Linear, Enum.EasingDirection.InOut,0,false,0)
		local cframeValue = Instance.new("CFrameValue", script.Parent)
		cframeValue.Value = script.Parent.CFrame
		local tween = ts:Create(cframeValue, tweeninfo, {Value = goal})
		tween:Play()
		cframeValue.Changed:Connect(function()
			script.Parent.Parent:SetPrimaryPartCFrame(cframeValue.Value)
		end)
		tween.Completed:Wait()
		cframeValue:Destroy()
		print("Yay!")
	elseif thingToDo == "move" then
		local tweeninfo = TweenInfo.new(8,Enum.EasingStyle.Linear, Enum.EasingDirection.InOut,0,false,0)
		local vectorlookat = Instance.new("Vector3Value", script.Parent)
		vectorlookat.Value = goal 
		local vectorvalue = Instance.new("Vector3Value", script.Parent)
		vectorvalue.Value = script.Parent.Position
		local tween = ts:Create(vectorvalue, tweeninfo, {Value = goal})
		tween:Play()
		vectorvalue.Changed:Connect(function()
			local positionWithYLeveled = Vector3.new(vectorvalue.Value.X, vectorvalue.Value.Y, vectorvalue.Value.Z)
			script.Parent.Parent:SetPrimaryPartCFrame(CFrame.new(positionWithYLeveled, vectorlookat.Value))  
		end)
		tween.Completed:Wait()
		vectorlookat:Destroy()
		vectorvalue:Destroy()
		if script.Parent.Position.Y ~= -7.5 then
			script.Parent.CFrame = CFrame.new(Vector3.new(script.Parent.Position.X, -7.5, script.Parent.Position.Z), script.Parent.CFrame.LookVector)
		end 
		print("Yay!")
	end
end
-- wait 10
wait(10)

-- loop to iterate over destination points and call the tweenBoat function
while true do
	wait(2)
	tweenBoat(CFrame.new(script.Parent.Position, placestogo[Destination]), "turn")
	wait(2)
	tweenBoat(placestogo[Destination], "move")
	wait(10)
	print("Tween played")
	Destination = Destination + 1
	if Destination == 4 then
		Destination = 1
	end
	print(Destination)
end

So, the boat keeps going under and then returns without its other parts to destination 1 once it reaches destination 3. How can i fix this? I am not sure what is going wrong.