Steps to reproduce:
1. Select "Add book" and enter an ISBN number in the search field.
2. When the book in question is listed, select "Offer in UBook".
3. Enter a negative price and some comments in the "Notes" box. Select "Add".
4. When prompted to enter a positive price, enter a positive number and change the comments in the "Notes" box.
5. In "My Offers", the book has the correct price, but the wrong comments form the first iteration. An example screenshot is attached.