Why do creatures respawn few seconds and disappears when they died?

[KrCha]

I damage them using Damage() func. And it works but when they died, a few sec later they respawn where they just died and disappear. How can I fix this problem?

[Hardcawcanary]

This could happen from having more than 90 spawned at any one time.

[KrCha]

It happened when spawn only one creature as well…