Why are artists I rarely listen to appearing in my top spots?

For instance, over the past four weeks, I have a single Taylor Swift song at the 50th spot on my playlist, yet she’s somehow my 3rd most-listened-to artist? That’s ridiculous! Below her are Billie Eilish and The Smiths, whom I listen to at least five times a day. Is Taylor Swift ranked so high because she was my number one most-listened-to artist in the past, even though I clearly listen to other artists more now?