So that people don't think it's going to the moon and buy up... redundancy is good when your relying on the data.
The LME, COMEX, and SHFE are all closed today. https://www.metalprices.com/p/exchange-holiday-schedule/ You'll see some movement of the aud gold price due to changes in the aud. The FX market is open.
Gees imagine how good it would have been if you were a precious metal trader to front run that. Big bonus and likely a potential promotion to lucrative share trading desk and where the real money is!
Like monopolize said, it's most likely an error in the feed that goldprice.org use for their charts. Here's the 3 day chart - look at the blue and red lines. At about 1800 NY time yesterday the blue line jumps from around $22.12 to $22.80, and then around 1800 NY time today (24 hours later), the red line drops back to about $22.12. Just a glitch in the matrix
2017 january average abit under $17. Februari sell on strength > $16 March sell on strength > $15 April sell on strength > $14 Then dealers replenish stock > $18, put their hedge back into place, > $20. Or, cease the business, and restart the luxe cab renting or so company.