Your estimated account value is based on the 5 STEEM you own. You do not have liquid STEEM or STEEM Backed Dollars so that isn't a factor. The +9.991 STEEM Power is delegated and is not yours so it isn't factored into the account estimated value.

In short you, you own 5.009 STEEM and STEEM is currently valued at $3.54 which puts your account value at around $17.732 USD. The estimate reported by Steemit uses a historical average and not the exact price at this minute.