Dear aspirant,

If the seat that you secured was an EWS seat, then it is pretty natural that students infront of you in the ews seats did not abort their seats for iit seats. See all the seats are not ews seats only a few handful are and those seats gets filled up like ews seat of cs it extc are much more preferable to those 5756 students infront of you thus they did not change their seat or choose any nit below rourkela. 

Trust me rourkela is a great nit and a lot of students are applying for the higher demand subjects like extc that is why you weren't upgraded. If this was some other lesser ranked nit then you could have been upgraded.

Whether or not your branch will be upgraded in the further rounds of the counselling process will depend on how you filled in your choices for during the choice filling process. If you have filled above your alloted branch those choices which are difficult for you to get then your branch might not get upgraded on the contrary if you have filled those choices which you might get then your branches might get upgraded. Hope this helps.