I happened to notice this in the rep-change dropdown list:
This is the only "user removed" event shown here on that site on that day. (You'll just have to trust me on that; the whole list of events for the day doesn't fit in the container.) However, look at this from the reputation tab of my profile:
Both agree on the total rep change for the day; it's just that one shows -5 and the other shows -10 for a removed user. I wasn't paying enough attention to know which is the real change.
I'm not bothered by the event (these things happen; no sense trying to figure out the details, and anyway it's only 5 or 10 rep). But I don't think I've seen a mismatch like this before, and the hobgoblin of little minds demanded that I report this apparent bug.