This is a continuation of the Excellent work by Nivekk. Without it, this mod would certainly not exist.
What's new CHANGELOG
Current Version: 1.1.3.0 - Released 2017/9/18
What is it
kOS is a scriptable autopilot Mod for Kerbal Space Program. It allows you write small programs that automate specific tasks.
With kOS, you can issue commands to your ships via a command line, or write programs to automate tasks. kOS can interact with other parts on your craft via action group
Just to report I have had this happen last night, in 1.1.2 with kOS installed but no RO. The parts I noticed it happening to were parts with KIS inventory space, and in one occasion I opened the KIS inventory and saw the mass readout mysteriously 'filling up' while editing in the VAB.
I've not been able to reproduce it, I chalked it up to random error and moved on, until I just now read this here.
So perhaps it's KIS, or an interaction between kOS and KIS?