Problem listing an item not in catalogue

Hi All

Been trying to list a book tonight that’s not in the catalogue. I fill in all the fields in each & catergory & clear all the red exclamation marks, but when I try to click save nothing happens. If I shut down I get this;
Unfinished listing found

We found a listing that was started but never finished.

Date:
14/03/2022 18:59:37
Product category:
Books > Reference > Other Reference By Subject > History
Would you like to restore that listing?

I say yes & all the red exclamation marks are back again, but all the fields are filled in, tried five times now!

Anyone have any thoughts please?

Regards
Ed