I could fix the Bug with the "NaN" in my Game by deliting all " % " in the file www/data/States.json. Looks like the game still reads the numbers as % this way the strength number can only go down to 1
On the other hand I noticed that in some states like "Nude" are two Stats as "message1" (+) and "message2" (-) both have for Strength 10 witen down. But this way thay cancel each other out and the numbers are stacked. I don't think that was intended that way, but I also don't know if it should be "-" or "+" 10% (in this instant) in the game.