Goodreads Librarians Group discussion

I am a new author. I see that my novel has several quotes attached to it now. While these lines are all from inside my book, most are actually epigraphs. Unfortunately, one is split into two quotes and the attribution is in the second quote. The others don't have an attribution at all.

I am wondering where these quotes came from. Kindle highlights? Could they be edited so that the whole epigraph and attribution appear together?

I deleted the ones that are clearly quotes from others. When they are attributed to someone else the quote should go under that person's name if possible.
Are any of the other quotes attributed to others?