The Steem Power in perentheses is delegated Steem Power, and the amount above is your Steem Power.
The sum of both amounts determines the worth of your votes and the amunt of bandwidth you can use by visiting Steemit. However, delegated Steem Power does not belong to you, it is a loan. All new users get some Steem Power delegated but it is temporary.
You can rent delegated Steem Power from other users, for example minnowbooster