Can you be more specific about the problem that you are seeing? I'm not seeing it on this end. Be sure to describe what you are seeing in the text of your message - the chart may change or look different by the time we investigate on this end.
The snapshot that you posted has a 10/17 closing price for $GOLD (continuous contract) of 311.60. Right now, Kitco.com shows the closing price for Spot Gold was 311.50 on 10/17.
So I'm not sure that I agree when you say "The closing price is way off." What data are you basing that on?
Similarly, StockCharts' closing price for $GOLD on 10/16 is 314.0 and Kitco.com's is 313.7 - a wider gap, but still explainable by differences between spot prices and continuous contract prices.
Below your second chart, you state "the date is the same but the closing price is very different (and correct)" On the chart I'm looking at, the data is identical to the data in the first chart you posted. So now I'm really confused. Did your snapshot change already?
Regardless of where the confusion is happening, here's how things work: We update our $GOLD price at the end of each trading day with the latest info from our data vendor. Each day, we update the quotes for the last couple of days in case the data vendor has made any corrections to their data. Corrections are made by the data vendor for a variety of reasons including bad trades, odd lots, and data processing errors. It's possible that our 16-Oct $GOLD quote was updated at the end of the day yesterday via this process - I don't really know. If it was, it may be the cause of what you saw.
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