What you are looking at now is the K-line diagram of the main sugar company, which involves the issue of the main contract for changing the month. Before 12, the main contract was 2 109. After 12 closed, the main contract of 13 was switched to the contract of 220 1, and there was a price difference, which is the gap you saw on the map.

The main K-line chart of futures is the K-line chart of the main contracts in each period, not just a certain contract. If you are a technical analyst, I suggest you look at the graph of a specific contract.