When I do a search I can see that some results are filtered. What's wrong?

In the search window there's a counter that says 'Filtered'. This means the amount of search results that have been filtered since you opened the window. This counter has not always been visible, although it has existed (internally) for quite some time.

There are four ways this counter can increase:
    * When you have selected 'Only results with TTH root'. (Directories will always show though.)
    * When you have selected 'Only users with free slots' or 'Hide files already in share'
    * When you have written "<search word(s)> -foo". This will filter search results that contain "foo"
    * When you have some Size or File type filtering set
    * When an autosearch has been performed in the background. If an autosearch is carried out, you of course shouldn't see the results of that search (because you are trying to find something else).

So, nothing is wrong it is simply filters out results that you don't want.