I don't think I can help you with that....If only some songs appear and their are the same format they should all show.
On another note....download Tunee.net from the site to your phone and get your music that way. Im sure it has every song your looking for.
On the topic of DLNA....when I stream the music from my phone to my XBOX360 it pauses during playback often. Is this a wifi signal strength matter or what? Anyone else have this problem?