Hi again .-)
I did some further research on the issue (running PitchFactor in stereo-in / stereo out mode):
The only affected effects are Octaver and HarPeggiator.
While the Octaver switches from mono to out-of-Phase randomly, the HarPeggiator always is out-of-Phase…
BUT: Only Pitch B is affected (Octaver and HarPeggiator), Pitch A is always mono i.e. one side of Stereo Image…