Hmm... I got below showed results from Stereo Liny EQ with C.Buddes VST Plugin Analyzer. "Am I mesuring"/"Is there" something wrong or is the EQ just programmed to do some 'extra' processing for frequencies and what 'bout the harmonic distortion level?
Magnitude plot:
EDIT: this was fixed by using fresh version of Plugin Analyzer.
Harmonic distortion plot:

Looks like it's in audible range.
The Stereo Parameter 'EQ seem to work otherwise properly but, harmonic distortion level seem to be 'bout same level as it is in Stereo Liny EQ.

Juha