I found a problem with my reputation graph. If I select a time interval then it doesn't show my bounties. On the following screen-shot you may see a selected interval containing 500 bounty, but the listing at right side of the graph doesn't show it.
It seems to be a regression because bounties was shown 2 or more months ago. See also related old question "The Reputation Graph is wildly inaccurate with reputation losses" from Jul 31 '10.