sticky notes / comment

i was reading pdf and inserting sticky notes for new content . everyday i edit and saved over old pdf. for after long edits i inserted signature and it was saved as new file then i inserted more sticky notes and i found that only 5 sticky notes were opening others were just icons . old pdf shows over 150 sticky notes but not new one because i worken on new ones. Help me find the solution (over 30 sticky notes were added after old pdf )

please reply and help.

thank you