I solved it. If you're concenrned and experiencing the same, it appears that on pc, when collision occurs and the first object uses fine detection and the other is not, the collision is handled as it should.
On Android, both objects "become" with no fine detection for some reason if one of them has no fine detection.
That's really too bad since I could use the extra efficiency of not using fine detection on Android on this project, but that's not possible :-(
Is an old information that in Windows, Objects that have BOX & Fine collision, the collision detection is upgrade to Fine Collision in Android BOX & Fine Collision is downgrade.
If you need fine collision in Android set bot object to fine.
... new things are coming ...