[toodeeptofind]

I am reading a book in kepub and previously every 2-3 page turns would increase page number by one which I understand depends on zoom level. But IDK since 2-3 days ago, the page number doesn't increase for like 40-50 pages then suddenly moves like 10 pages. Say it is on page 32 and only after 50 page turns it increases to 38. Where are page 33, 34, ... 37?

I am using send to device feature in calibre.