Both B/L are correct, the B/L showing 1 of 4 are the original B/L, while the 1 of 3 are the non-negotiable B/L. The reason why the N/N B/L has 3 pages only is because the texts on the last portion fitted to the last page (which is page 3) unlike in the original B/L the text does not fit on the 3rd page, hence the last line of the sentence/note was on page 4.