Institute or Institutes?

In 2005, THES lumped all the Indian Institutes of Technology and Management (five of each according to the World of Learning) as single institutions. Now, according to the QS site, only one of each has been included in the rankings. In both cases the -s has been omitted

This could be a simple error or maybe the error was in 2005. Consultants who can change the name of China's most venerable university or confuse undergraduate students with faculty are probably capable of anything.

But if there is really only one Institute of Technology and one Institute of Management this year, which one is it? And did QS ensure that they collected data from only one and not from all the institutes?

I wonder when we will know?