Futures contracts are different from stocks. Futures 1609 contract means that 16 is due for delivery in September, which is not always continuous. After the contract of 1609 ends, the contract price of 1709 will continue. If we pay attention to the time, the latter should be the price of 1609, while the former is the contract price of 1509.

If you want to find continuous contracts in futures, you can look at the "main continuous contract" or "iron ore index" on the software, depending on what software you use. This kind of contract is not tradable, but developed by the software side. When the main contracts are merged, the chart looks continuous and is convenient for technical analysis.