Linda Raschke: Fix mistakes immediately
This video is a very good condense summary why you should fix your trading mistakes immediately.
One thing I like to add here is that sometimes the mistake is not yours.
It can be your broker who made the mistake for call in orders. It can also be technical problems like internet outage, power outage, brokerage side connection to exchange is down. You name it, I probably experienced that.
It is not, however, an excuse or reason to not fix the problem right the way.