This happens whenever you kill someone while the Strength 2 potion is in effect.

 

I have this problem also.

 

I'm fairly sure this is caused by the way SG handles kills. When the last hit to kill a player is dealt, it will grant the kill to the last thing that dealt damage to the player that didn't kill them, not the thing that actually killed them, because it teleports them out of the game before the true last hit that kills them is actually truly dealt.

Strength potions, since they instantly kill the player if you have the right weapon, don't have anything to say the player died by. The player is teleported out and considered dead before they actually took damage it could record they took. I'm almost sure that it would credit you if you killed them with (or at least hit them once with) fists while the potion is active, since it would take more than one hit to kill them.

In summary: Yes, it's because of the strength potion. It's probably because the server tracks kills by last non-killing hit dealt, not the killing hit, and if there wasn't one recently, it just says "PLAYER" killed them to fill in the blank.

 

Yes, this time it's intended. It's the same problem. But so far the problem seems to lie in bukkit, not the sg plugin.

 

There was an sg bug i saw, where a player killed someone to win the sg. But when the sg message showed up it said
"player A won $300 to win the Survival Games with 0 Kills"
whats that all about?

 

Bump, still happens, hopefully it gets fixed

 

This is possible because players can kill each other at the same time. Should 2 in deathmatch kill each other in the same hit, the third player would win despite not actually killing either of the others.