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What are the Shanghai and Shenzhen weighted varieties? Why is the position in that month bigger than that in Shanghai and Shenzhen? Why is the position of Shanghai and Shenzhen 300 worthless?
The weighted index of stock index futures is an index obtained by weighted average of the prices of various contracts according to their respective positions. This value is the stock index futures index, which is not a contract itself, so there should be no positions, but the software may add up all the positions to calculate its positions.

The CSI 300 is a stock index, and the subject matter of the stock index futures contract is not the contract itself. Of course, there is no position.