becuase they didn't process your submitted application - this is what happens when they return the application.Also PA got a letter saying they need his military records plus asking to pay the Right of Permanent Residence fee again. Which we did when we applied initially. I'm not sure why they never asked his military records previously when they returned the application twice..
Happened to a friend of mine, returned about 4x and when they got AOR, they requested more documents.
For the RPRF, just submitted the receipt.