Hello,
Maybe its because PaHUB and sensor QMP6988 have same I2C adresse 0x70.
Possibly modify PaHUB adresse to 71 by soldering on the component.

@ajb2k3 By the way , now we speaking about I2C do you know why Icannot use PaHub and Hat 8 servo in same time ? Is not the same I2C 0x38 vs 0x70 ? Its seem the first i initiate in script will be the only will work.

Hello,
Maybe its because PaHUB and sensor QMP6988 have same I2C adresse 0x70.
Possibly modify PaHUB adresse to 71 by soldering on the component.