I literally had loose nuts on the Ochd module I bought.
I've personally only had problems with 2 of my modules, a Second-hand Erica Pico DSP (mode button and/or LED flickers about but it still works), and my DIY build of a Robaux LL8 which occasionally fails to rejister a button press (still very usable).

Enjoy your spare HP, don't rush to fill every last space, this is not like filling sticker books. Resist the urge to 'complete' your rack, its never complete so just relax.

https://youtube.com/@wishbonebrewery