why there is such a difference between yahoo data and future price of the NASDAQ?

Hi everyone.I usually analyze the nasdaq index with yahoo data .Recently I found a problem ,the Nasdaq index provided by yahoo is about 5900 ,and the dec 17 future price of the mini nasdaq is about 5400. why there is the difference ?
 
Futures are on the nasdaq 100 (^ndx), the 5900 is the composite, the wider nasdaq market, which doesnt have its own future.
 
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Futures are on the nasdaq 100 (^ndx), the 5900 is the composite, the wider nasdaq market, which doesnt have its own future.

I found the yahoo also provides the data of Nasdaq 100,but I am not sure the accuracy ?
which data feed would be better?
 
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