I was just wondering how the album/file information is input (number of files, file size)

The particular one I'm looking at is this, but I'm sure there are more. It has a few problems:

• Number of files is doubled (there are 47, says 94)
• Some of the files end up being 1KB and unusable though it says they have a normal file size, whether mass or individual downloading (song numbers 17, 18, 28)
• Thus, total file size for the album is actually smaller than it says

This seems like the kind of thing that would be automated by some script when the files are uploaded rather than manually entered, so I'm just confused as to why they're wrong. Maybe the 1kb (corrupt?) files were there once but have changed for some reason?