Local Files played instead of Spotify Catalogue

[sxnti]

Hello, I been having a problem the last few days: the thing is I have a live version of Ariana Grande "Dangerous Woman" in my local files but everytime I try and play the studio version, every song that´s in my local files folder get played instead. This happens for all songs, except those that have really different metadata (e.g. Knew Better/Forever Boy is split in two individual songs in the concert series, so this plays the studio version).

How can I stop Spotify Desktop from doing this?? 

I won´t change any metadata because I have my Last.fm account connected and I don´t want two versions of the same song scrobbled, when I consider them the same.

Thanks.