The price of futures trading is the current price you mentioned, and this price is also the physical delivery price of buyers and sellers after the futures contract expires. As for why there is a profit and loss, it is because the price of futures contracts has changed and people's expectations for the future have changed. Futures prices are dynamic, while your trading price is static, so there is a price difference between futures prices and trading prices, so there is a profit and loss.

Supplementary answer: Futures natural person speculators are not allowed to enter the delivery procedure, and only legal persons can enter the delivery procedure. If you are a speculative warehouse, you must close your position before the delivery month, so there will be profits and losses, and daily settlement is inevitable.