You sent an Avenger and 2 SBDs against the carriers. The Avenger was aborted by Kaga and an SBD was aborted by Hamp, leaving one SBD available to attack. But wait! The aborted SBD has Press the Attack!
Whenever this unit is aborted by a Ship's Antiair attack, you may roll a die. On a 1, destroy this unit. On a 4 or higher, this unit makes a Bomb attack during your Air Attack phase, hitting on a 5 or higher only.
Oh, bummer, the SBD was aborted by a Fighter’s Antiair attack, not a Ship’s. It can’t use Press the Attack since it wasn’t aborted by a Ship so you only have the one SBD coming through this turn.