You can only undelegate Steempower that you control. That 14 Steem that you see in brackets is SteemPower that was delegated to you by Steemit Inc. in order to open an account for you. Every account created on Steemit has a cost and they paid that on your behalf so that you can get started using the platform. It is not yours though, it still belongs to them and they can undelegate it once you have enough Steem power of your own.

Once you have your own Steem power you can then delegate and use it in any way you'd like.