It almost sounds like the file didn't attach properly or possibly was corrupted during transmission and they couldn't read all or part of it...I haven't submitted ours yet, so I'm not familiar with the method that they provide or generate their feedback on their end..it could be just check boxes on their end and those generate the "reasons" in their response. Might not be a "couldn't read it" choice for them to select. I would do exactly as you say and resubmit the application, particularly because they accepted yours.

"We are tied to the ocean. And when we go back to the sea, whether it is to sail or to watch - we are going back from whence we came." ~ John F. Kennedy