Some kind of omni setting in Kontakt itself possibly? Picking up the CC from any channel?
Or possibly the CC is on same channel but a different track in RB.(?)

Just a couple ideas.
However, disabling send last controller usually works.

I wonder if the Kontaxt VST has the initial setting buffered or in memory somehow .. it's weird that it happens as soon as you hit play.
I suppose the Kontakt could be reading the track volume and resetting itself.
(in that case it's a 'feature!)

<confused>

Make your sound your own!
.. I do not work here, but the benefits are still awesome