How to fix glitch ? (Animation Idle Staying even after I unequip the sword)

The sword named Nichirin, here the code:

local module = {}
function foundkatanatool(char)
    wait(.1)
    local tool = char:FindFirstChildWhichIsA("Tool")
    if tool then
        local typ = tool:FindFirstChild("Type")
        if typ and typ.ClassName == "StringValue" and typ.Value == "Sword" then
            return true
        end
    end
end
module.EquipNichirin = function(character)
    local model = character:FindFirstChild("SwordModel")
    if model and model:IsA("Model") and character:FindFirstChild("Humanoid") then
        local anim = character.Humanoid:LoadAnimation(script.Idle)
        anim:Play()

        if character.EquippedKatana.Value == false then
            character.HumanoidRootPart.UnSheathe:Play()
            local unsheatheanim = character.Humanoid:LoadAnimation(script.UnSheathe)
            unsheatheanim:Play()
            unsheatheanim:AdjustSpeed(.5)
        end


        character.EquippedKatana.Value = true

        local weld = model.Handle:FindFirstChild("HandleWeld")
        if weld then
            weld.Part0 = character:FindFirstChild("Right Arm")
            weld.C0 = CFrame.new(0, -1, 0) * CFrame.Angles(math.rad(270),math.rad(180),math.rad(90)) * CFrame.Angles(0, math.rad(90), 0)
        end
    end
end

module.UnequipNichirin = function(character)
    local model = character:FindFirstChild("SwordModel")
    if model and model:IsA("Model") and not foundkatanatool(character) and character:FindFirstChild("Humanoid") then
        local anim = character.Humanoid:LoadAnimation(script.Idle)
                anim:Stop()

        local anim = character.Humanoid:LoadAnimation(script.Sheathe)
        anim:Play()
        anim:AdjustSpeed(.8)
        character.EquippedKatana.Value = false

        local weld = model.Handle:FindFirstChild("HandleWeld")
        if weld then
            delay(.12,function()
                if not foundkatanatool(character) then
                    weld.Part0 = character:WaitForChild("Torso")
                    weld.C0 = CFrame.new(-1, -.1, -1.2) * CFrame.Angles(math.rad(200),math.rad(180),math.rad(90))
                end
            end)
        end
    end
end