You only just mentioned you got a pgwp of less than 2 years. How can I know that it was 12 or 16 months
According to
https://www.canada.ca/en/immigratio...st-graduation-work-permit-program/permit.html
For a pgwp for 2 one-year courses,
T"he student completed more than one program from
an eligible DLI within 2 years", meaning doing two courses from only one DLI
YOu did 2 courses from 2 different institutions. So therefore the decision was correct to only award pgwp for the 2nd course.
you can apply for gcms notes, but it would state the same thing.