Hello Aspirant.

Hope you are doing well.

First of all calm down and don't panic may be this has happened because of some error but I'll suggest you that if it is showing this again after reopening the site several times so you should contact the higher authorities of NMAT exam because they can help you much better with this and will guide you to what you'll have to do next and they make sure that your problem will get solved.

ALL THE BEST, STAY MOTIVATED AND HOPE THIS HELPS.

Thankyou.