Omg i had a similar experience before. I need to go to sleep but let me do it after I write this. I found Animal on torrent before it was out and it had like 19 tracks (some of them were "(Bonus Track)". I also searched YouTube for "Animal bonus tracks" and I thought Animal had like 10 bonus tracks over the world. I downloaded it, bopped to them even though some sounded off but kept doing it till I bought the CD when I found it.
I put it on my father's car on our way home then I was like Why does Hungover have the title lyric in the song and is a totally different song? Then I listened carefully and some songs the instrumental changed, some songs stayed the same and some were completely different. Then I realized the one I listened for weeks was a compilation of her songs released officially or put on YouTube by her, leaked demos and unreleased.