Music hidden in library but visible in playlist

[unrealbe]

Hello,

I have some music in a playlist that I can't find in my library itself.
I think I might have hidden them as duplicates and I want to undo that.

Can anyone help me?
I updated to the latest version but still not showing. Also I checked but no filters active.
Screenshots:
http://puu.sh/oSw1C/e7dccee71b.png
http://puu.sh/oSw2H/f690bc202f.jpg

Thank you.

[redwing]

It is possible to have tracks in playlists that are not in your library. Select the track, right-click and Send to, and see if music library is available or grayed out. If available, that means you haven't imported them to the library.

[unrealbe]

I solved it, in duplicate manager go to the bottem and unmark all the files selected here.

It worked for me:
http://puu.sh/oSSzT/6ee26d92ba.png