[Bug-wget] files changed to directories!

[e-letter]

Readers,

Just learned an interesting observation: navigated to a directory
containing some audio files (mp3, ogg, etc.)

Activated the command:

wget -r -A *.mp3 http://url/to/mp3/files

After download completed, some the majority mp3 files became empty
directories, but curiously a minor few (estimate 10 %) remained as
audio files:

ls showed

audio1.mp3 became audio1.mp3/

The moral, be careful fellow novices! :)