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There is an event named rep change on this reputation tab. The tooltip says "arbitrary rep change":

arbitrary rep change

What does that mean? When does a "rep change" occur?

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Well, badge bonuses such as API Evangelist, for one thing. That's clearly not the case here, though. – a cat Mar 2 '12 at 15:26
up vote 8 down vote accepted

In the case above there was a very old bug that allowed people to offer a bounty worth more than their current rep. To fix our mistake we have credited back any rep that would have pushed the running reputation below 1.

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