Players character resets online but not in studio?

When I launch my game online and insert this script that replaces the players character into the PlayerScripts, after a few seconds, it resets the players character to its default and reloads the startergui. I can't find where it's going wrong. Thanks for any help!

wait(.1)
local player
while not player do
    wait()
    player = game:GetService('Players').LocalPlayer

end
function weld(p1,p2,c0)
    local w = Instance.new("Weld",p1)
    w.Part0 = p1
    w.Part1 = p2
    w.C0 = c0 or p1.CFrame:inverse() * p2.CFrame
    return w
end

function onSpawn()
    local char = game.ReplicatedStorage["New Player"]:Clone()
    local SpawnLocation = game.Workspace.SpawnLocation2
    char.Parent = workspace
    char.Name = player.Name
    char:MoveTo(SpawnLocation.Position)

    local prevChar = player.Character
    wait()
    player.Character = char
    prevChar:Destroy()

    if char:FindFirstChild("Humanoid") then
    char.Humanoid:Destroy()
    end
    local human = Instance.new("Humanoid", char)
    char.Archivable = false
    human.WalkSpeed = 8

    wait(1)

    human.Died:connect(function()
    wait(1)
        onSpawn()
        SetOutfit()
        wait(.01)
    player.Character.Humanoid.Running:connect(onGround)


    end)

    --Player Values
    local move_left = false
    local move_right = false
    local already_ran = false
    local grounded = false
    local idleAnimation = Instance.new("Animation")
    idleAnimation.AnimationId = "rbxassetid://317651678"
    local runningAnimation = Instance.new("Animation")
    runningAnimation.AnimationId = "rbxassetid://319211805"
    local R2 = Instance.new("Animation")
    R2.AnimationId = "rbxassetid://312976450"
    local I2 = Instance.new("Animation")
    I2.AnimationId = "rbxassetid://313623015"
    local J = Instance.new("Animation")
    J.AnimationId = "rbxassetid://326922088"

    function playAnimation(parent)
        local AnimTrack = player.Character.Humanoid:LoadAnimation(parent)
        AnimTrack:Stop()
        wait(.01)
        AnimTrack:Play()
    end

    function onGround(speed)
        if grounded == false then
            grounded = true
        end
        if speed > 1 and player.PlayerGui.SwordPlaySystemMK2.CombatStage.Value == ("Offensive") then
            if already_ran == false then
                already_ran = true
                playAnimation(runningAnimation)

            end

                elseif  speed > 1 and player.PlayerGui.SwordPlaySystemMK2.CombatStage.Value == ("Idle") then
                    if already_ran == false then
                        already_ran = true
                        playAnimation(R2)
                    end 


            elseif speed > 0 and already_ran == true and player.PlayerGui.SwordPlaySystemMK2.CombatStage.Value == ("Offensive")  then
            already_ran = false
            playAnimation(idleAnimation)

            elseif speed > 0 and already_ran == true and player.PlayerGui.SwordPlaySystemMK2.CombatStage.Value == ("Idle")  then
            already_ran = false
            playAnimation(I2)

                end
            end
        end

onSpawn()


    player.Character.Humanoid.Running:connect(onGround)

    --SetOutfit()
    wait(0.5)
    PE.Parent = player.Character
    local SP = game.Lighting.SwordPlaySystemMK2:Clone()
    SP.Parent = player.PlayerGui
    SP.Disabled = false