Hello there.
I'd found that when I choose number of decimals will be shown in my pop-ups for custom NC stats it breaks up.
So, for example I have stat that shows 5% on me, but when I set to show 2 decimals for it and nothing else it shows 20.78% in place of 5.**%. So without decimals it works fine and numbers are roughly same with those wich NC test shows, but with decimals it's completely wrong.