Dear Swathi,
Thank you for your reply. We do conduct exit interviews. The fact is, all of them until now have praised the organization, the ambiance, and the working atmosphere, and have always been happy. However, there is still something that prevents them from staying on. When I say "staying on," I am referring to more than 2 years, as 2 years is a normal tenure for our team members.
To provide you with some insight into the industry, we operate in the education sector, and the majority of our staff consists of faculty members and project heads.