For example, if I wanted to download www.site.com/dir1/ and dir1 contained files: 1.txt to 5.txt... It would only download 1, 2, and 5.txt. Or some other combination, but never the whole directory. All the text files being in the same dir, if some were downloaded, why not all of them?
Also, the project didn't use any keywords or filename filters. So *that* is not the problem.
You may also give me more details to reproduce this case.