Why does my following object stay a few studs behind me?

I'm trying to make Thor's axe and I'm making the summoning of the axe but while I'm running it stays a few studs behind me.

    --BP is BodyPosition
    while WSLoop == true do
        local state = Character.Humanoid:GetState()
        wait()
        if state == Enum.HumanoidStateType.RunningNoPhysics then
            BP.Position = Character.RightLowerArm.Position+Vector3.new(0,3,0)
        elseif state == Enum.HumanoidStateType.Running then
            BP.Position = Character.RightLowerArm.Position+Vector3.new(0,3,0)
        end
    end