I've been having the issue concerning Anna’s KP max as well. I play on PC, btw. In previous versions, Anna's KP max was set to 100 right from the start, but as of update 22.12, it seems to be set to 40. The wiki doesn’t mention any ways to increase to Anna’s KP max. I also tried loading old saves where I had brought Anna’s KP up to 100 and the bar had the first 40% blue and the last 60% grey. After interacting with her, you lose 60 KP.