Perhaps this is by design, but I notice that rep changes caused by my own actions are not always listed in the detailed view of rep events. Now, of course I know when I do a down-vote or something, but a consequence is that if one were to go through and add up all the events displayed, the total would not match what SE says is the total. Now, I would never do that, but I notice that a lot of people consider reputation as a serious personal matter and get quite vocal if they think they have been "cheated" in some way.
But what's my question? Simply whether this is a bug or an intentional design choice.