heya, that is prefab loot. npcs are a heavy scientist, so they will drop heavy scientist prefab loot.
you can change this in the profiles, oxide/data/RaidableBases/Profiles/
here is an example to spawn only roaming scientist loot, which has fewer less powerful items
"Spawn Alternate Default Scientist Loot": {
"Prefab ID List": [
"roam"
],
"Enabled": true,
"Disable All Prefab Loot Spawns": false
},
here is an example to spawn no prefab loot
"Spawn Alternate Default Scientist Loot": {
"Prefab ID List": [],
"Enabled": true,
"Disable All Prefab Loot Spawns": true
},
you can have specific loot items dropped on death with these options,
Murderer Items Dropped On Death, and
Scientist Items Dropped On Death