SO . I invite you to modify your first comment.

to include (during the purge) it is very important to specify clearly.

and I could only tell you one thing.

The game has a spawn limit for all creatures.

once the limit is reached. the dead bodies of slaves and ennemi disappear.

so I think that reducing the spawn numbers of enemy soldiers could fix this problem.

I also had this problem many times.
I lost a lot of weapons and armor.