Nord Rack 2 semitones potentiometer misaligned with label

[frekvencia]

Hello,

I got a second hand Nord Rack 2 (non-X) and I noticed that the semitones potentiometer is not aligned with it's label. What I mean by this that the OCT LED doesn't light up when I turn the dial to the octave positions. It seems that the positions between +12 and +60 are nearly aligned but the positions between -60 and 0 are not and I have to adjust my deal somewhere in-between two positions to light the OCT LED up.

Since this synth is really old I cannot say if my pot just drifted with age, or if it left the factory like this. I would have guessed that the variances in the potentiometers are compensated in software but couldn't find anything regarding calibrating the potentiometer readings.

Did anyone encounter something like this?