Of course, exactly the same scene is attached but with different Subframe Steps, the one that works correctly is set to 1 but if the Subframe Steps are increased (example to 20, but also 4) the dynamics of the spheres assumes a strange and incorrect behavior.
ps. Always remaining on the subject I would like to remind you that xpDynamics does not work with the cache being rendered, this is a problem that I reported some time ago but I don't know if it has been resolved.
This is a great feature but unfortunately with these problems it is unusable in any work.
SIMPLE BALL scene - SubSteps 1.c4d
SIMPLE BALL scene - SubSteps 20.c4d