During the Necromancer Amulet quest, after killing Caranya, all the dead Mages had a Coarpse value of 4.29497e+009.
One of them was NPC 00032940 (in Oblivion.esm) with script 000146CA. This Mage was carrying a Nec robe, Rough leather shoes and the Fort Ontus key.
In TES4Edit, The Bashed patch overrides the Full name field with "Mage Heevan" and the MODL with SkeletonBeast.nif. Other than that, there are no conflicts.

Has anyone ever seen anything like this before?

I Also found that only the Necromancers are affected. After leaving Fort Ontus, I killed some creatures and badits, but their values were fine.

ScriptName MG16MageScript

;This script is placed on all mages in dungeon Fort Ontus
;Covers faction/disposition change that takes place after player has killed Caranya and
;forces NPCs to attack the player

short doonce

begin gamemode

if ( GetDeadCount Caranya > 0 )
if ( GetStage MG16Amulet >= 30 ) && ( doonce == 0 )
setfactionrank MG16FortOntusMageFaction -1
setfactionrank NecromancerFaction 0
removeitem magerobe 1
additem necromancerrobe 1
EquipItem Necromancerrobe
moddisposition player -50
modav aggression 50
set doonce to 1
endif
endif

End

Any suggestions for troubleshooting this problem? I have the save before entering the Fort backed up.
I guess I could just ignore it and move on.