Hi, its a bit unfortunate that you deleted your old reports however I still have your logs.
So on 20/11/2017 12:49 you ran against your …/iTunes/Music/Miles Davis/Kind Of Blue and looking at your current option it looks like of the six songs, one was already matched to MusicBrainz and the other five were not, and hence we only looked for a search for the remaining five and matched them to https://musicbrainz.org/release/e7ba3cb7-a074-45ee-870f-3baeb6d3e8bf, and it looks like the other one was already matched to https://musicbrainz.org/release/d6a1f166-8a02-4608-849b-9d623912c3e5 - could that be possible ?
Also in the report you have you have the option Nur dann Entsprechung, wenn alle gruppierten Songs einem Album zugeordnet werden k�nnen (Only allow match if all songs in grouping match to one album) option disabled, this allows Songkong to break a logical grouping if it cannot find a match for all songs in the grouping so I wonder if this is what originally caused the issue, generally its a bad idea to disable this option if you are interested in albums.
So songs 1-5 are still in …/iTunes/Music/Miles Davis/Kind Of Blue, Im confused are these the files you cannot find, or is the the one track you cannot find ?
I assume this option is not visible to your Melco, so when you say they you cannot see them isn’t it because you haven’t copied them over to your Melco ?
I don’t this issue actually has anything to do with the IS_HD option