When I launch up this code, it does what I want it to do but it also does something else?

When I launch this code it makes the head move vertically up/down. Here's the script.

wait()
Tool=script.Parent
CP,Torso,g=nil,nil,nil
necko=CFrame.new(0, 1, 0, -1, -0, -0, 0, 0, 1, 0, 1, 0)
getPos=function(Pos,TorsoPos)
    return Vector3.new(Pos.x,TorsoPos.y,Pos.z)
end
Turn=function(mouse,Torso,Gyro)
    g.cframe=CFrame.new(Torso.Position,getPos(mouse.Hit.p,Torso.Position))
    offset=(Torso.Position.y-mouse.Hit.p.y)/100
    mag=(Torso.Position-mouse.Hit.p).magnitude/80
    offset=offset/mag
    neck=Torso.Neck
    neck.C0=necko*CFrame.fromEulerAnglesXYZ(offset,0,0)
    arm=Torso:FindFirstChild("Right Shoulder")
    if arm~=nil then
        arm.C0=CFrame.new(1, 0.5, 0, 0, 0, 1, -6.48200512e-007, 1.00000274, 0, -1.00000274, -6.48200512e-007, 0)*CFrame.fromEulerAnglesXYZ(0,0,-offset)
    end
end
Equi=function(mouse)
    wait(.2)    
    CP=Tool.Parent
    Torso=CP.Torso
    g=Instance.new("BodyGyro")
    g.P=18000
    g.D=600
    g.maxTorque=Vector3.new(80000,80000000,80000)*50000000000000000000000000
    g.cframe=Torso.CFrame
    g.Parent=Torso
    while true do
        if Tool.Parent.className~="Model" then
            break
        end
        Turn(mouse,Torso,g)
        wait()
    end
    Torso.Neck.C0=necko
    g:Remove()
end
Tool.Equipped:connect(Equi)

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In this picture, you can see the head is moving up but the arms are shrunken in and the legs are expanded out. That's all I to be need to be fixed.