What I expected to happen was...:
I was writing in a book and I pressed sign. I typed a name and hit cancel by accident. I pressed sign again. I thought I would get to change the name.

What actually happened was...:
I was writing a book with the book and quill. I pressed sign and publish it. I wrote the title and was about to hit sign and close, but at the last second I remembered to add something. I hit cancel and added that thing. I hit sign again, and I didn't get a chance to change the book's title. I actually messed up on the title so it looks ugly!

Steps to Reproduce:

1. Get a fresh book and quill
2. Write a short thing like "123"
3. Press "sign"
4. Make a short title like "Code"
5. Press cancel
6. Try pressing sign again
7. The Book and Quill signs without asking for the book title again

Code analysis by marcono1234 can be found in this comment.