Do not understand the growth in the producer price index of oil

It looks weird. Figure below shows daily change in oil price futures during the previous three months. There is no big difference between August and September 2011. I would estimate the change as negligible.  At the same time, the PPI of crude petroleum (not seasonally adjusted) grew from 241 to 275.9, which is approximately the level of June. It should be a mistake.

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