The reason its like 191/701 is because it is reputations/reputation level. I don't know why they aren't in order though.
Edit:: I believe it is out of order because the two people that have close to the same rep are on the same reputation level, which could confuse the system. Therefore flawing the order. Thats just my guess, and well thought out answer.
Actually, each person has a set amount of reputation. Therefore, when they rep someone, they give them a small percentage of their rep points. So lets say someone had like 500 or so, they'd probably give out around 10 points per repping.