We understand that mistakes may happen, especially when contract months are rolling over.
If you have started the trading day trading the wrong contract month make sure that you flatten that trade. You can then roll your contract to the front month (highest volume) and continue trading. No rules will record as broken.
Please note that we do understand that mistakes can happen regarding which contract month you are trading. However, we require traders to be in the front contract month. Continued trading outside of the front month can result in a rule violation.