Voltage controllerboard fluctuating

The voltage on my controller board on one of the pololu’s is fluctuating (from anywhere between 25mV to 900mV), turning the poti, doesn’t change a thing I switched it with on another axis and still the same, does this mean its broke?

btw, the other 3 pololu’s are working fine. It’s a new set, so the controller is brandnew.

Update: I allready found out wat is was, the poti was broken (half of the “body” was missing)

Please return the defective item for exchange under warranty conditions.
Sorry for the inconvenience.

Velleman Projects Tech. Dept.
Legen Heirweg 33
9890 Gavere