Similarly, the top two suggestions for me were both sequels to books that I had selected.
Interestingly, I asked ChatGPT for recommendations based on the same list and it gave me a very similar result, including matching the top two suggestions! Coincidence? (I added a note that I was interested in finding new authors and it gave me a much better list.)
EDIT: The recommendations still feel less like AI and more like k-means clustering.