Of course it can't be the same. The price of the contract itself is not fixed, so this will happen. Due to the weather in September, the output in some areas will be high, so the price will be low. On the other hand, 1 1 year, 1 month, due to natural weather and other reasons, the output will be low, so the price will naturally be high, and there are many people speculating on the main contract, so the price will fluctuate frequently.