Sub Phatty crackle issuea

Hi,
the last week I bought a SUB PHATTY but actually I notice a clipping issue on deep bass presets. I just worked with one OSC (VOL KNOB set at 6 o’clock) and no overdrive was used. I checked that the crackle is audible in every audio out (main and phones).
Is it a normal behavior? The crackle occurs in more complex patches too, I just tried to create a simple example.
Thanks
Dino

Actually the “cippling” appears not only on bass presets, but for sure with greater frequency on deep ones.

Did anyone head about this problem?