Why is University of Waterloo ranked so low in the world

Why is University of Waterloo ranked so low in the world university of waterloo qs University of Waterloo; University of Calgary; University of Ottawa; Western University of Waterloo CanadaWaterloo #7 in Best Universities in Canada university department of chemical technology aurangabad CSRankings: Computer Science Rankings ; 1, ▻ Carnegie Mellon University closed chart, , 184

university department of chemical technology aurangabad Waterloo - Western University - Queen's University

university of waterloo qs Analyze the same research information and publication data the QS use to inform their reports with Scopus and SciVal  QS World University Rankings for Mathematics 2014