I have a blog where I post my links to downloable videos. One of it (I posted yesterday) has a very strange statistics:

Deliveres Uniques Attempts
3,956 2,503 23,521

the strange fact is that I have just 20 downloads for that video!!

Compared it to a similar report

Deliveres Uniques Attempts
3,529 3,074 5,903

I have 3437 downloads for it!!

Someone has any idea how it is possible?