I know the Eurorack world is some kind of wild west, but I wouldn't sell a module that can get destroyed just by... connecting it to another module.
You need to send about a hundred volts to an input to destroy its voltage to current resistor. This applies to all my modules (except Links' buffer input that only handles voltages within -12V .. +12V).
It could also be that the MODULATION pot is defective. Do you see any change when you adjust the MODULATION knob?