Tween gradually decreases Y Value

[yoshicoolTV (coolyoshi)]

Hello! I am trying to make random Position every second and for some reason the Y Position of the AlienShip decreases after it loops 1 time. I can’t tell why its happening. It’s supposed to stay always 238 but in the screenshot, it always goes down. The Union is has no collision on. Anyone got a solution why?

function AlienAttackEvent()    
	local Alieninfo = TweenInfo.new(
		1,
		Enum.EasingStyle.Linear
	)
	local CloneAlien = ServerStorage.Events.AlienAttack:Clone()
	CloneAlien.Parent = Map.Events
	local Time = 50
	while Time >= 1 do
		local RandX = math.random(-317, -51)
		local Y = 238
		local RandZ = math.random( -84, 158)
		local spikepos = Vector3.new(RandX, Y, RandZ)
		local AlienTween = TweenService:Create(CloneAlien.AlienShip, Alieninfo, {Position = spikepos})
		print(spikepos.Y)
		print(CloneAlien.AlienShip.Position.Y)
		AlienTween:Play()
		Time -= 1
		task.wait(1)
		if Time == 1 then
			CloneAlien:Destroy()
			break
		end
	end
end

This is what the Output shows:

[labra_doodle12]

Is the changing of its position visible when you playtest the game?

[yoshicoolTV (coolyoshi)]

Yea, the Position of the AlienShip is set to the 2nd prints and then tweens to the 238, and after a time it jitters because of that

[builderinbusiness (cookithefirst)]

is it unanchored?
charsssssssssssssssssssss

[yoshicoolTV (coolyoshi)]

Omg. I missed that. I swear I turned it on while checking. Ugh… Well thank you. Have a good day

[builderinbusiness (cookithefirst)]

les go i speedrunned it
woooooooooooo
you too

[grandisy (Grand)]

Assuming your model / part is correct :

you could add a completed event to wait for the previous tween.

here is how

function AlienAttackEvent()    
	local Alieninfo = TweenInfo.new(
		1,
		Enum.EasingStyle.Linear
	)
	local CloneAlien = ServerStorage.Events.AlienAttack:Clone()
	CloneAlien.Parent = Map.Events
	local Time = 50
	while Time >= 1 do
		local RandX = math.random(-317, -51)
		local Y = 238
		local RandZ = math.random( -84, 158)
		local spikepos = Vector3.new(RandX, Y, RandZ)
		local AlienTween = TweenService:Create(CloneAlien.AlienShip, Alieninfo, {Position = spikepos})
		print(spikepos.Y)
		print(CloneAlien.AlienShip.Position.Y)
		AlienTween:Play()
		AlienTween.Completed:Wait() -- Wait for the current tween to finish
		Time -= 1
		task.wait(1)
		if Time == 1 then
			CloneAlien:Destroy()
			break
		end
	end
end

[yoshicoolTV (coolyoshi)]

World Record
chaaaaaaaaaaaaaars