Flak explodes directly after firing?

I watched a few tutorials about fighting interceptors and especially the swarm. They puzzle me because things go differently when I try to follow.
After having destroyed a heart and boosting away with the Krait MK2, I get a distance of about 5km from the spawned swarm and then reverse with FA off. Targetting the approaching swarm and firing the flak does not hurt the swarm at all. It looks as if the flak explodes directly after having fired it at the swarm. In tutorials however I see that the flak shell takes few seconds to reach the swarm before exploding.
What am I doing wrong?
 
If only there was a clue in game 🤔

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Oops :ROFLMAO:
 
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