VEP 7 does not appear to want to work with Kontakt as a mix of stereo and mono outputs.
I haven't done extensive testing as I haven't used it as a mono anything.
The AU version does only have a Mono and a Stereo version; as a stereo version I ran consistently into the situation where past stereo 10 there is a confusion I believe occurs according to the Kontakt paradigm of outputs which VEP 7 is not dealing with correctly, where two mono outs is expected two and three stereo Input channels output from one Kontakt output channel. EG: VEP 11, & 12 have signal from 11 in Kontakt.
I would recommend dealing with Kontakt on a limited basis at least doing mono and stereo separately for the time being. I reproduced this behavior over and over the other day and I was reproducing other users' results.
However, I was only doing this with 'Kontakt Stereo' (VST, BTW), I did not try the VST Kontakt 16out or 8out.
You have these regardless of connecting with Logic, in VE Pro. Try that next, I suppose. I'm kind of out of time for reproducing this particular behavior.
https://www.dropbox.com/s/1rilhu68l0ty0we/as%20VST.png?dl=1