This is NOT weird. This is common and happens to everyone. The agent that is sending you the notes redacts classified information as per the rules outlined in the Access to Information and Privacy Act (ATIP). They are obligated to mention under which sections the information is being (rightly) redacted under. So, don't worry about this.
Here is a link to the act -->
http://laws-lois.justice.gc.ca/eng/acts/A-1/
You can see for yourself that a government organization has the right to refuse information (in the case of GCMS, the parts containing this "classified" information will be redacted) under the following sections.
Hope you get your PPR soon!
Good luck and all the very best!