teebeekid and I resolved this on Gearslutz (I was having the same issue). Turns out that the synths were transposed down an octave (transpose is a feature of the kiwisix board) and the hardware is just incapable of responding to CVs from the keyboard below the original range.
Message
Re: [PolySix] My Polysix is acting very weird...Please HELP!
2014-07-12 by pac8s@virginia.edu