How do I read the history of my reputation?
I see some [blank] and inconsistent reputations with the real upvotes here for 2012-08-20
Is this an expected behaviour or some kind of bug?
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I am assuming you are talking about your reputation for dated 20th Aug. have a look at to following image,
Well as per the reputation rule, you can earn maximum 200 reputation from the upvote/downvote. The upvotes after that limit will not consider any reputation increment. This rule doesnt include accepted reputation or bounty reputation.
It seems you've hit the reputation cap of 200. Well done. This is explained in How does "Reputation" work?
The relevant quote is:
"You can earn a maximum of +200 reputation from upvotes and suggested edits in any given day. Accepted answers and bounties are counted separately"
This is because the user reached the 200 rep-per-day cap. There can be some inconsistencies when you reach that cap.