Ok, habe mir die Dateien angeschaut: die MusicBrainz Album Ids sind 
unterschiedlich:

id3v2 tag info for 06 - Trouble.mp3:
TALB (Album/Movie/Show title): Parachutes
TPE1 (Lead performer(s)/Soloist(s)): Coldplay
TIT2 (Title/songname/content description): Trouble
TRCK (Track number/Position in set): 6
UFID (Unique file identifier): http://musicbrainz.org, 36 bytes
TXXX (User defined text information): (MusicBrainz TRM Id): 
0e66fc78-d6c8-4029-90ab-88b3e6ec694c
TXXX (User defined text information): (MusicBrainz Artist Id): 
cc197bad-dc9c-440d-a5b5-d52ba2e14234
TXXX (User defined text information): (MusicBrainz Album Id): 
435fc965-9121-461e-b8da-d9b505c9dc9b

id3v2 tag info for 07 - Parachutes.mp3:
TALB (Album/Movie/Show title): Parachutes
TPE1 (Lead performer(s)/Soloist(s)): Coldplay
TIT2 (Title/songname/content description): Parachutes
TRCK (Track number/Position in set): 7
UFID (Unique file identifier): http://musicbrainz.org, 36 bytes
TXXX (User defined text information): (MusicBrainz TRM Id): 
7a29927e-ebec-4f43-8756-168e7ccbcdf3
TXXX (User defined text information): (MusicBrainz Artist Id): 
cc197bad-dc9c-440d-a5b5-d52ba2e14234
TXXX (User defined text information): (MusicBrainz Album Id): 
96f9405e-7fc4-4a24-8a4c-b72cffa10df4

Du solltest diese Tags entweder bereinigen oder entfernen. Ebenso empfehle ich, 
die id3v1 Tags aus allen Dateien zu entfernen. 
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