Zynga Poker did a little tweak with the game design that affects the impact of how the bankroll is seen when you sit at a table. The chip balance found on top of the screen does not include the chips brought in a table. Your total chip balance will be updated and reflected once you return to the lobby.

This may cause some confusion that winnings aren't added immediately, but rest assured that there are no 'missing chips'. This is done to make winnings and deductions more noticeable in-game.