Birth Flow is causing collision despite PhysX deactivated

[Alexx31]

Hello,

I have a scene with chain reactions, which means it's a long timeline.
So I need to cache parts and then to import the tyCache into the next Tyflow.

My first tyCache should not interact anymore, just play fast. But as soon as I import it, it collides with an object.
I have tried
- PhysX switch: deactivate (which should make it to simple non-colliding particles, right?)
- Also tried to assign different simulation groups (so that they do not interact afar I know)
Of course set to "continuous".

Why can that happen and what can I do?

Thanks