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KHlover said:

Yeah, NDS software undertracked by 150Mil and nothing is done about it. Basically all PSVita games undertracked...no adjustments after the NPD numbers...

In the case of DS software it's because a lot of the older software just wasn't tracked.  If you look back to 2004/5 there were relatively few games being tracked, especially in Europe.  PS2 software is undertracked by about 300 million for a similar reason.  Unless companies release shipment data for the individual games, it's difficult to know where those software numbers actually go.