Keep in mind that Release Radaris a playlist of new releases recommended just for you.
It gets updated every Friday with music released over the past few weeks and includes artists you listen to the most and some new discoveries based on your recent listening. This would explain why you're seeing tracks from an artist you're not following.
No worries, as the more you use Spotify, the more personalized Release Radar becomes. Just keep listening to the songs you love!
Hope this helps clarifies things :)
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"Kindness is the language which the deaf can hear and the blind can see." - Mark Twain