What went wrong for Third Round?

Last week, because of the Friday stock report, the price of wheat saw a quick strike. I have read that “under a range trading strategy, you would sell the market when it gets to the top of its range and buy the market when it gets to the bottom of its range”. I guessed that after a fast increase, the wheat price would welcome a downward trend in short term. However, the situation of short stock of wheat would rise up the future price especially before another harvest coming. Therefore I hold a short position on December contract and a long position on March contract. I just followed the news as well as price change on the website of GMEGroup. However, I ignored the most important thing, backing to fundamental analysis of commodities—the supply and demand of wheat. From above chart, we can see that wheat future price showed a downward trend, but with a little bit change. Therefore the base for W2Z and W3H are so low that there was not a large gain or loss on my account. Until, Oct.6^th, there was a relative big jump. I am still looking forward to a big increase in March price. Because the farmers expect a higher price due to recent short stocks, then I guess that after experiencing a harvest in Australia and South Asia, farmers would increased stocks to raise up the price. However, the price on September just saw a big jump. Therefore it is too hard to say that the price would go father in March. Also I made another mistake, I offset my long position on W3H from Saturday, however, the trading system delayed that proposal. I lost the good opportunity to lower my loss.