Why did IRCC return both my 2 photos with my passport and copr?

I recently received ppr and I sent my passport and 2 photos to them. They returned my passport and the copr. One of my photos is attached on copr, but the other photo is also returned to me in the envelope. Is this a mistake? Shouldn’t they keep the other photo?

Thank you in advance.

This is expected. I reckon the other one is a “just in case” extra. Same thing happened to me and I had no issues landing.

Thank you ak45! Feel much better now.