Unusual problems with global queue upload

Me and my friend are working on transferring a ton of files using smartftp, and i walked him through using the global queue so he didnt have to sit one file by one.

But now I have this strange problem. The files were transferring are 10 mp3s about 10 megs each. The ones he uploaded before he figured out global queue are fine. But afterwords, all the mp3s are incomplete. They are missign the last half/quarter/some random amount. But other files keep uploading. Now the files have finished uploading and all of them are partially incomplete, and they will need to be re-uploaded. What gives?