Character arm with tool not moving while the animation is playing?

So I am having trouble with script that will play animation when equipped.The animation without tool plays fine and on players screen it looks fine too but to other players it looks like everything animates except right arm with the tool. Here is the Local script that plays animation:

local tool = script.Parent
local anim = tool.Animation
local plr = game.Players.LocalPlayer
local char = workspace:WaitForChild(plr.Name)
local hum = char:WaitForChild("Humanoid")
local track = hum:LoadAnimation(anim)
track.Priority = Enum.AnimationPriority.Movement

tool.Equipped:connect(function()
	track:Play()
end)

tool.Unequipped:connect(function()
	track:Stop()
end)

Anyone knows whats the problem is?

make sure you have a right animation for it, or if all else fails, use a animation ID system