IITD prepares its own rank list which takes in the count of your percentile. So if you have “x” bonus marks then for IIITD rank list your percentile will be (your jee main percentile + x).

Also, IIITD rank list takes count only those candidates who had filled IIITD in their preference list not everyone.

That explains the situation of yes

So I hope you understand their selection procedure.

If you have missed counseling someone else might have taken your seat. Still once you might try to contact thrt via call to put forward your case