Same here.
I think it has to do with the fact that the mod matrix is bipolar.
The frequency knob of the the LFO imparts a negative offset starting from value 24 and below.
And even then, the mod wheel doesn't push the LFO frequency as high as the dedicated LFO frequency knob can.
While checking this, I think I've discovered a bug in the Mod Matrix, when setting 2 identical mod slots (to add them up together to get an increased range) the frequency of the LFO resets itself to 0 when passed a certain point, instead of keeping going up in speed until reaching the maximum... Bizarre.