Hello,

The authorities gave time to the candidates to update the EWS category. Incase case you did not change it then it could be invalid. Another instance could occur that as the exams where stretched  due to the pandemic your EWS certificate was no longer valid. If it expired during that period then that could be reason why you were valid for EWS category hence your Gen-EWS rank is not shown in your rank card.

Hope it helps.

Good luck.