weird problem

[Maddolis]

If a plane or other vehicle explodes on the ship and somebody dies from the explosion, the kill will be registered to the last person to hit him/her with whatever weapon.
Same as if you're on the ship and you punch someone, then they jump off the ship and get killed in a vehicle/barrel explosion while you remain on the ship.

I can't figure out why it says you killed him with a minigun (you'd have to be in a fighter jet or actually have a minigun), although I have come across numerous really strange bugs in sa-mp that can be explained but not replicated. I wouldn't worry about it, just continue to play as you usually do.