The linked report lacked some information that might put more context on the reversals. First, how many cases does each District decide and what percentage of those are reviewed by the Supreme Court. Maybe the Ninth sees a huge volume of cases and dwarfs the output of the other Districts. Maybe the Supreme Court reviews a smaller proportion of the Ninth's decisions so the reversals are a smaller percentage of the total District output compared to others.
Wikipedia had some older information on the Ninth District
United States Court of Appeals for the Ninth Circuit - Wikipedia
For 1999-2008, the Supreme Court review 0.151% of the Ninth's decisions. That means the Supreme Court agreed with 99.849% of the decisions.
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