No! No other reason. It is a mistake from officer's end. Even my University's IRCC representative is trying to connect with IRCC now.
When I called the IRCC, they told me after reading the notes that the officer thought the 2 subjects I took to be part time, however, each subject was big one and is considered full time in my university. Moreover, many of my classmates took similar course distribution (some even too exactly same as I did) and got the PWGP by IRCC or CBSA. There is, however, one girl who got refused with same reason, weird thing is she applied on the same date as I did and got refusal on the same day I did. We even have similar names. This is horrible how they never read documents properly.