1) A subdomain can belong to a different user in the DreamHost panel. This means you'll FTP in as a different user and it's won't be paired with the main domain. This is NOT how I do mine.
2) If you like to keep them together, go back to the Panel and Edit that subdomain so it belongs to the same user as the main domain. I believe it'll copy the files over. If not, you'll have to do it manually.
So that's Part 1 of the problem – the directory structure.
Part 2: Do 1xxx5 and 3yrd both belong to you? They don't resemble each other. Regardless of FTP directory structure, the subdomain should work properly. Sometimes it takes a little while before DNS and everything catches up.