You could be seeing fake files. Try the ones with less sources (10 or so). Vary your search terms...look for artist or album name only. Also try the All Types search. There's more info in the 2 threads below.

Fake files showing up in search results

How to find music

If it's really happening with every file you try to download, delete LW's preferences folder when LW's properly closed. See points 2 & 3 below for instructions
Fixes for LimeWire