This gets even weirder. I tried to email the file concerned to myself as a .pdf, but instead of opening up the email app and selected email Document - .pdf file, my Pages app just crashed.
I've also tried downloading from icloud.com onto my Macbook Pro (Mountain Lion) too, but i still only get the first 1/4 page worth of notes. The rest are blank.
Also tried accessing the same file on my MacBook Pro with Pages also installed, but again, i just see 1/4 page of notes and the rest of the pages that follow are blank.
However the thumbnail image of my document shows that the first page is completely filled with text. So the full notes must be hiding somewhere - just that i somehow cannot access them. Strange.
Never have had these problems with Pages previously before this.