According to What is reputation? How do I earn (and lose) it?:
You lose reputation when:
- your question is voted down: −2
- your answer is voted down: −2
- you vote down an answer: −1
- you place a bounty on a question: − full bounty amount
- one of your posts receives 6 spam or offensive flags: −100
I know that I have lost a few reputation points in the last 24 hours, however it is not reflected when I checked the "Reputation board" (don't know if it has a more appropriate name), I only see reputation points gained.
Where can I have a look at the reputation lost points?