In the menus to the left of the search results, make sure that you have 'All' selected.
Do you have your junk filter set to 'do not display junk'? If that's the case & your junk filter has recognised some files as junk, they won't be displayed & you'll see those numbers in parentheses. You could try relaxing the junk filter settings.
Junk Filter

Has this only started happening since you installed a particular LW version? If you have some old installers saved, try going back to an earlier LW version & see if things change.

You could also try deleting LW's preferences folder when LW's properly closed. See point 3 here & also point 2 if you've used older versions of LW in the past (there could be a folder in either location).
Fixes for LimeWire
This will kill all of your settings within options, you'll have to go back through afterwards & reset things. If you're not sure of your settings, go through LW's tools > options & write them all down, so that you can reset things later.