Cascade particle systems works only the first time...what's happening?

I’m developing a project on Unreal 4.24.3, it’s an old project, anyway all the particles systems made with cascade worked fine until yesterday when a strange behaviour started.
I can use whatever particle system i want, it doesn’t matter if placed directly in the level or spawned by a blueprint, in any case the particle works the first time it’s fired (imagine an explosion particle) but from the second time it lacks parts of it and it is like stretched and out of the correct scale.
Why this?