Why is sprinting animation stacking?

[Qmenator]

I’ve been working on this sprint script for a little while to get it as perfect as possible and I have come to a script that works decently well. However, when I change directions while sprinting it seems to either stack the animation or stop it from playing past a certain point.

The main code:

repeat task.wait() until UIS:IsKeyDown(Enum.KeyCode.LeftShift) and Humanoid.MoveDirection.Magnitude > 0
					Humanoid.WalkSpeed = Speed
					SprintingTween:Play()
					local Anim = Instance.new('Animation')
	Anim.AnimationId = 'rbxassetid://11567015463'
					local PlayAnim = Character.Humanoid:LoadAnimation(Anim)
						PlayAnim:Play() 
	warn("running")
	
	
		repeat task.wait() until not UIS:IsKeyDown(Enum.KeyCode.LeftShift) or Humanoid.MoveDirection.Magnitude <=0
				Humanoid.WalkSpeed = DefaultWalkingSpeed
				WalkingTween:Play()
				PlayAnim:Stop()
	end)

A video of the issue:
robloxapp-20221130-1612421.wmv (2.6 MB)

[astraIboy (The Batman)]

Are you showing us the full script?

[Qmenator]

No but the rest of it is mostly just variables

[astraIboy (The Batman)]

You should store the run animation inside a variable outside of all that, your constantly creating it when pressing down left shift, which may not be the problem but its good practice to not do that

[Qmenator]

That did help it from stacking, but now it resets the animation when I change directions
robloxapp-20221130-1702541.wmv (1.1 MB)

[astraIboy (The Batman)]

Check if the animation isnt already running using this
@Qmenator

if not PlayAnim.IsPlaying then
 -- play the animation
end

https://create.roblox.com/docs/reference/engine/classes/AnimationTrack#IsPlaying``