Hi - I used to have problems with Kontakt Master Volume settings all the time, and did some online research and found the following, which stopped the Master Volume setting in a Kontakt loaded instrument from acting like it had a mind of its own:
1) Open the instance of Kontakt with the instrument giving you a hard time
2) Click on the Wrench icon on the left of the instrument
3) Click on Instrument Options
4) If not already on Controller, click on Controller button
5) Remove the check from the box (option) labeled: "Accept standard controller for Volume and Pan"
6) Click on 'Close'
7) Click on the Wrench icon again to toggle back to the instrument's normal display panel.
I do not recall if I did a Save for the instrument or not, after making the above change, so if the next project you find the problem returning again, then make the above change again, and save the instrument to make it work that way all the time. I just can't recall one way or the other on that point.
ALSO please note, I did the same change for Battery 3, as it too had the same volume issues.
I sincerely hope the above helps,
Bob Bone