Can you put those somewhere where I can grab them? Deduping only looks at the musical content (tags are ignored) ... Is it possible that the tune is the same but it just differs in tags, or are you saying the actual content of the song is different too? If they just have different tags, then this is behaving "correctly". However, it is a known issue (and sort of tricky to resolve) that if you have the identical song in two albums that it will detect the second as a dupe.

ms