Hi Babel,
I can't help you much there only that my HiPass has no problems. So yes, perhaps you either use too much power and/or next or close to your HiPass module is another module that's interfering your signal perhaps?
Good luck with the troubleshooting and kind regards, Garfield.
For review reports of Eurorack modules, please refer to https://garfieldmodular.net/ for PDF formatted downloads