Some Particles doesn't delete

[G😹nz😻]

Hello, i'm currently on troubles... why?
I happen with the tf2 particles
I can see that if some particles are cleared (only those having maturity) but those are fixed, they do not have to do with the miraculous ("ply: StopParticles")
I am confused and need help, of course, thank you very much for your help

[lua]if killer:GetNWBool("New_Particles") == true then
killer:StopParticles()
timer.Simple(2, function()
ParticleEffectAttach(Particles[killer:GetNWInt("Level")],PATTACH_POINT_FOLLOW,killer,1)
end)
return
end
[/lua]
Old particles delete, and create again...