You're referring instead to "planes shot down"?
It's possible the Hakuryu used their heal extremely effectively as your picture shows you having nearly 25,000 damage dealt to planes (which would kill 10 Planes normally). It's more likely that your AA did damage, but other ship AA finished the kill on several planes. As I said before, the Hakuryu likely lost 4-6 planes if it attacked 4 times. It could have been more if part of your AA damage was from Flak puffs that can see retreating planes more likely to be shot down as well.