Before the payout, the $ amount is the total split between the author and the curators. Once payout occurs, only the amount that was paid to the author is displayed. The author gets some where around 75% of what is displayed before the payout, and the curators (people who up-voted the post early) get the rest split up amongst themselves. Additionally, the author gets paid 50/50 between Steem Dolllars and Steem Power.