Why is the cutoff rank of the IIIT Allahabad IT branch so low (4550 as of 2017) when it is comparable to CS in other NITs and some IITs?

My younger sister has enrolled in the CSE program at NIT and it has excellent facilities for the program. The brand name of NIT and IIT is still more popular for some of the engineering aspirants because they lack awareness. Even my sister thought so before admissions, but NIT ranks #16 on the NIRF Engineering scale, IIIT A ranks #103, and IITs are usually in the top 5 in the same. 

Furthermore, your decision may change based on the following-

• The location of IIIT Allahabad is a factor contributing to its low popularity. It is located in a small village area called Jhalwa. There are no recreational facilities around and the only eating outlets are MacDonald's and Dominoes, which harm in the long run.
• The placement statistics of IIIT A show that it has a good 96% placement rate, but not many top companies come to visit because of the location. Networking is not an issue, but an institute in a developed area would have easy accessibility, lectures by renowned faculty, spots of refreshment; which are not present here.
• The hostels are not very good and those who reside in them, face difficulties related to social outings.
• Another fact of importance is that this institute has only two departments: Information Technology and Electronics and Communication.

You can see below, the comparatives of the institutes:

As you may see, IIIT A and NITs have excellent placement rates. The faculty will be more brilliant at IITs but students are dissatisfied even there. So you can see for yourself according to location, placement scenario, and brand name if that matters.