It seems even after posting detail video, you didn’t understood the actual issue or may be I couldn’t explain you.
Point 1 - Default number coming which can create error
Point 2 - I know last state is saved, Even @nithin replied the same. But that is the exact problem. In hurry trader might overlook between Lot & Qty which can lead to over positioning, calling additional risk leading to account blow off. This is as simple. Anyhow its person to person matters how it’s perceived.