That still remains a mystery I think and it is likely due to the photos not following the given specifications. Based on what I have read it's usually those that are taken overseas that have this issue.Do you guys any idea why they are asking Photo again? is your photo taken date is more than 6 month? Did you submitted same photo for COPR and PR?
Yes they use the same pic as the COPR. It maybe that they are more lenient when it comes to COPR but when they actually make the PR cards they check specifications again. That's my own theory.