Thanks - yes, I am not worried about it, but was curious. It would be nice info to have for people who apply afterwards.Hard to answer bro. It could be many, many things, including suspicion that maybe they thought your certificate was fake; anything. I'd suggest putting it behind you and taking a break, you waited a long time to earn your PR.
So, I am guessing that you do not have that line on your GCMS? Thanks @moscatojuices