Below are the reasons for the same:
1.The Browser is set to input date in the format MM/DD/YYYY.
2. However for your ADDA the input date has to be in the format DD/MM/YYYY.
3. To Prevent any wrong entries we have disabled Typing on the date field.
4. Please change the setting in your Browser/Operating System to match the expected format and you can edit the date fields with your keyboard.
5. Till you change the setting, you can still click on the Date Picker calendar to select the date.
You can change the setting by following the below steps:

Go to Browser Settings >> Languages >> Preferred languages >> Move the "1. English (United Kingdom) " to top.