how it is possible that NITH site is showing 45 eligible candidates for placement from ECE dual degree even I watched in seat matrix that there are only 28 seats in ECE dual branch at NIT Hamirpur.From where the other students came into ECE dual branch.
see the placement Information is totally depends on the particular college and their policy, now the students generally depends on the official website of the particular website for this type of related Information and to tell the truth , there is various mistakes found in placement related Information. some times it can be 2/3 years old. so it would be best to ask in the college group or senior students for the placement scenario.
also there is some chances that seat matrix has changed for the current year in particular branch.
hope you may understand.