Red recording light doesn't turn on during RAW shooting in 5D MK III

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I am sure I saw the red recording light turned when I shot on before but after re-installing the config file it doesn't turn on now. The file records fine and I can see the red light on the bottom flashing, but the red tiny light on top doesn't turn on.

The light turns on when I shoot in other modes. It is happening only in RAW shooting.

Did anyone saw this phenomenon before? Any clue will be highly appreciated.

Thanks.