So the only explanation for 3 kill actions probably because
Magnet: The first Target, regardless of whom it is targeting that Night, affects the second Target instead, and vice versa.
Let's say the magnet targets are Lanji and Reborn. The first target is Lanji a vigilante. Lanji targeted someone who was saved last night (fail kill) and Lanji action also affect magnet's second target Reborn and thus Reborn died. Lanji then got killed by mafia.
Is there other possibility for 3 kills?