Not getting kills on quest

so today I killed a lvl 52, 2lvls higher than me at leviating towers. Normally I should get one kill closer to claim the Hero of Archipelago quest...but I didn't. Quests says that I need 5 kills (so not the key one).
Comments
Did some other quest use up that kill credit, like perhaps the Rune Key quest? It seems to me that a kill can only go to one thing.
Another option were you in a group with higher group level than your enemy?
Ihit,
No, that is impossible...
Trongster,
I didn't have a quest like that that day.
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