Last pages of my big Word File cannot be seen (See pic)

I have a huge (17MB) word file. Something strange has happened to my last 10 pages. I can't see them. They are there and shown with grey shadows. I can click over them but cannot open them.

Any idea pls?

Untitled 1.jpg

I selected whole document and set paper as A4 and then these pages came back. Seems something was wrong with the paper type.