AnimationEvents beeing called as much times as the animation were ever played. Help?

As far as i know:

• Im using Animation Event to cast a spell at a certain point of the animation,
• but everytime i call :Play() on the loaded track, it looks like it creates another extra parallel track,
• when i call :Stop() the track is actually still there in the background and stopped.
• Calling :Play() again creates a new one and restarts ALL of them.
• The event (for firing a spell) is called as much times as there are animations ever played in the "background" when the point of MarkedSignal of the one showing animation is reached.

In the end: - When i start an animation, the number of progectiles it casts is somehow multiplied by the times i've casten before, but im not 100% this what i describled is causing it.

How do I fix that? How do I destroy the animation instead of just calling :Stop()? Or is there any other mechanic to make the old onimations be ignored?

local Players = game:GetService("Players")
local player = Players.LocalPlayer
local character = player.Character
if not character then
    character = game.Players.LocalPlayer.CharacterAdded:Wait()
end
local humanoid = character:WaitForChild("Humanoid")
local mouse = player:GetMouse()
local RemoteEvent = game.ReplicatedStorage.RemoteEvent
local SkyBlastControl = false
    local StormCast = workspace.StormCast -- mudar
    local StormCastTrack = humanoid:LoadAnimation(StormCast)

mouse.Button1Down:Connect(function()
    SkyBlastControl = true
    local hit = mouse.Hit
    StormCastTrack:Play() 
    StormCastTrack:GetMarkerReachedSignal("SkyBlast"):Connect(function()
        if SkyBlastControl == true then
            print("SkyBlastCasten")
        end
    end)
end)

mouse.Button1Up:Connect(function()
    SkyBlastControl = false
    StormCastTrack:Stop()
    print("unclicked")
    for _, track in ipairs(humanoid:GetPlayingAnimationTracks()) do
        if track == StormCastTrack then
            track:Stop()
            break
        end
    end
end)

Here is the output:

Necro_las applied edits to script StormScript - SkyBlastCasten - unclicked - SkyBlastCasten (x2) - unclicked - SkyBlastCasten (x3) - unclicked - SkyBlastCasten (x4) - unclicked (x5) - SkyBlastCasten (x9) - unclicked