If you want to increase your delegation, you will need to just delegate the full amount. For instance,if you want to add 100 sp to the 100 sp you delegated earlier, you will need to delegate 200 all at once which then remove the 100 you delegated before. There is no addition in delegation bit the full amount has to be done at once. As it stands, you have only delegated 100 sp and not 200. We hope that you will do the right thing. Thank you for your support