I was not able to reproduce the issue I was having, however it was consistent enough that I had to remove this mod.
Basically, seemingly randomly, I would lose the bonus the mod was providing to my inventory spaces. I see an old thread about losing on death, but I have not died in my save yet, so it isn't related to death.
This did start happening after I started using teleport tech in my Nullius playthrough so maybe it had something to do with the teleport tech.
Sorry I can't provide info on how to reproduce the issue, but removing this rpg system mod immediately fixed my inventory.
