If you go to the 'artist' box to the left of the search results & click on All... you should see most of the results shown (e.g. 148/150). If your junk filter has recognised some files as junk & you've set the filter to 'do not display junk' then some files just won't ever show up.

LW's just doing it's best to show the most relevant results, according to your original search, by not showing them all straight away (if this makes sense)