Originally Posted by PeterT
The reading info. is based on whether the book is an ePub (ie sideloaded via calibre, ADE, Windows Explorer or any other means) or a Kobo ePub (kEpub) loaded via WiFi or Kobo Desktop.
ePubs show page location within the book; kEpub location within the chapter.
Peter, many thanks - so presumably if I can convert it to epub I should be fine? It is interesting, as I was reading the same book on another device, and thought it was an epub, as there I had the book percentage - but perhaps it was that reader which could not manage the database like the kobo does...