Touch Re-borrowed (renewed) books from openlibrary.org do not work

I borrowed an epub book from openlibrary.org, and I could read it in ADE and on the Kobo Touch.

When there were only a couple of days left of the loan, I wanted to "renew" it, so I returned it using ADE and borrowed it again. The newly issued book is readable on the PC in ADE, but when after I dragged-and-dropped it into Kobo it displays the "OOPS" DRM error message.

Also, the book is listed under the Kobo device icon in ADE, and if i double click it in the Kobo list I can read it in ADE.

I tried deleting all files from the device that have a similar name to the re-borrowed epub, and also checked that the database has no reference to this title.

I experimented with more books from openlibrary and found the same result - reborrowed books go "OOPS" on the Kobo.

So how does the Kobo remember that this is a title that has already been read? How can one clear this record so that it will display the book as per the fresh loan?

Thanks and Regards,
swamp thing