Files with multiple sources (numbers in the # column) count towards the total result. So...say that you saw 10 lines of files & each file had 10 sources, that would total 100 files

If you see numbers like this in the search tab (100/500) then you're only seeing 100 results out of 500 found. This could be because you haven't selected 'all' in the filter results, to the left of the search page. Or it could be because your junk filter has picked some files as junk & you've set your junk filter to 'do not display junk'.