After looking through the PVPlog2 I found these lines.
"06/29/08 18:19:34: PARTY_KILL, 0x00000000013E6325, Poisonlotus, 0x511, 0x000000000100A157, Bruticus, 0x10548; nil, nil, nil, nil, nil, nil, nil, nil", -- [27]
"06/29/08 18:19:34: Processing death of: Bruticus", -- [28]
"06/29/08 18:19:34: I killed Bruticus (Level 41 Night Elf Druid) at [52,26] in Tanaris (Gadgetzan).", -- [29]
"06/29/08 18:19:34: SPELL_DAMAGE, 0x00000000013E6325, Poisonlotus, 0x511, 0x000000000100A157, Bruticus, 0x10548; 26679, Deadly Throw, 1, 544, 1, nil, nil, nil", -- [30]
"06/29/08 18:19:34: recentDamaged[3]: Bruticus", -- [31]
"06/29/08 18:19:34: SPELL_CAST_SUCCESS, 0xF1300024F4002170, Gadgetzan Bruiser, 0xa48, 0x00000000013E6325, Poisonlotus, 0x511; 12024, Net, 1, nil, nil, nil, nil, nil", -- [32]
"06/29/08 18:19:35: UNIT_DIED, 0x0000000000000000, nil, 0x80000000, 0x000000000100A157, Bruticus, 0x10548; nil, nil, nil, nil, nil, nil, nil, nil", -- [33]
"06/29/08 18:19:35: Processing death of: Bruticus", -- [34]
"06/29/08 18:19:35: I killed Bruticus (Level 41 Night Elf Druid) at [52,26] in Tanaris (Gadgetzan).", -- [35]
It looks to be processing after PARTY_KILL then again after UNIT_DIED... Thus is making 2 logs about 1 kill.