Date of leaving abroad (CKGS online form)

Your are correct with your dates understanding.

Don’t worry. These dates don’t really matter.
I don’t think CKGS verifies them anyway with the real data!

We have renewed our family’s each person’s passport separately and every time we just gave the most recent entry exit dates and passport was renewed with no issue.

I believe that this form and questions have not been updated for decades. The government of India still think that people who have left the country do not really visit home often as would happen in 70s.
Whereas, these days, 90% of people travel out and come back to USA almost every year.