Layers not show when open Illustrator.

I'm working on illustrator, everything was ok until i save as PDF. In review i can still see all the details and picture attachments. But when i open both the AI files and PDF some of the details disappear even though you can still see it in review section. I've tried to restart the computer and still have the same problem.

This is how it looks on AI

and this is how it looks on review section with all the details still visible.