Hi

Get in touch with the authorities asking your query https://jeeadv.ac.in/contact.php

I don't think its a serious issue it maybe a mistake which can be rectified even during the counselling when you will have to produce original documents. Relax and It would be better to get an official reply from them on this issue to be on safe side.

Stop panicking and get back to your studies its more important. Be completely sure of the details before submitting the final button in the future.

All the best.