Simple Animation Problem: Animation cuts out?

Problem with animation: https://gyazo.com/9a545dd2e13f8e2054e24cadbbb9bf1a

I made an animation that plays whenever the player runs while wielding the sword with the script below. It kind of works -- as seen by the link above -- however it gets cut off a lot. I've tried some different things such as:

-- Changing the priority(I tried every single one)

-- Disabling the "Animate" Script in the character

-- Changing the duration of the animation

-- Using a remote function(As seen in my current script)

-- Reading the Wikia

What else can I do? I was thinking of replacing the default Roblox run animation when the weapon is equipped but I read on the Wikia that it doesn't work anymore.

Server script inside sword(Part of the script):

local repStorage = game:GetService("ReplicatedStorage")
function Equipped()
    Character = Tool.Parent
    Player = Players:GetPlayerFromCharacter(Character)
    Humanoid = Character:FindFirstChild("Humanoid")
    RootPart = Character:FindFirstChild("HumanoidRootPart")
    if not CheckIfAlive() then
        return
    end
    ToolEquipped = true
    Humanoid.Running:Connect(function() 
        local a = repStorage:WaitForChild("PlayAnim")
        a:FireServer()
    end)
end

Tool.Equipped:connect(Equipped)

Server Script in ServerScriptService:

local repStorage = game:GetService("ReplicatedStorage")
local remote = repStorage:WaitForChild("PlayAnim")

--//Remote Event//--
remote.OnServerEvent:Connect(function(player)
    local run = player.Character.Humanoid:LoadAnimation(game.ReplicatedStorage.Anim.SwordRun)
    run:Play()          
end)