Experimenting with mine, I have seen some things I cannot explain but overall have to conclude the filter is tracking properly.
In one test, using the built-in Cubase Tuner plug-in, when I started out with the settings (env amt=0, resonance=max, keyboard=full, cutoff=approx 3 (tuned to A by ear using the reference tone), I found it tracked fine but could be off by maybe plus or minus 7 or 8 cents in either direction, which to me is a musically useful (if not pleasant) amount of detune and would be typical for the oscillators a VCO synth... Then with some minor knob tweaks, suddenly I found that even at the same settings, with a new init patch and repeating the adjustments, everything was off by a much higher range, plus or minus 40 cents which is very noticable. Then I pressed the Tune button to auto calibrate, and then repeating the test, the detune amount was approx 2 or 3 cents in either direction (about as tight as it can get with an analog synth).
Switching between filter types 1/2 or 3 didn't seem to matter.
So I have to conclude for now there is no problem with my particular unit here -- but it does seem to suggest that when calibrated, the filter tuning should track reasonably closely, at least not a half-semitone off or anything.