Thanks for reaching out about this here in the Community. We'll gladly share some light on the situation.
The way the app is currently structured, if the same song is uploaded twice, let's say in two different versions of an album, it's recognized as two distinct songs. This has the advantage that if the sound quality was remastered or any changes made between the two releases, users can enjoy them both.
It seems also that some other users feel the way you do and went ahead and posted this idea requesting the feature to consolidate duplicates. You can add your support there by up-voting the idea. We'll inform on any developments there, as soon as there are any. So make sure to subscribe, if you haven't already.
Hope you find this useful. Keep us posted if you have any questions.
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“Music acts like a magic key, to which the most tightly closed heart opens.”– Maria von Trapp