Simply because the 100% (at the bottom) is actually 10% of the exp required to level up.
I know that sounds confusing but not sure how to explain it :o
Well leveling up at Isro is slow, so some may suggest private servers to you.
Well most private servers are stable and range from 5x to 700x times faster than isro speed of leveling up and starting from 70 cap up to 120 cap.
http://www.srstats.com/homeIf you take going to private servers in mind, look at that link.