EDIT: It just look a long time to update. I went back today and the read books are missing from the unread list.

I am buying books for my pet to read and the ones I bought and read to my pet are not updating to read. For example: I bought and read it to my pet. I bought a 2nd one to test out and It no longer give me to option to read it to that pet, but it still shows up in books left to read.

It's working better now. I just tried it and it updated immediately, thank you!