Hello everyone here is my problem

when there is 2 enemies and I kill one, the defeated ennemy reappear after the turn is finished (with 1 HP )

same goes with my party member

here the script I use all Yanfly

Class System
Learn Skill
Steal Item
JP manager

finally I solved the problem myself seems I'm forced to have [Death] States on states one

Yes, that's standard even with VX.