Tracked changes - lost
 

I have a shared workbook being updated by a number of users. When I select
the option to show ALL tracked changes on a new sheet the Action Number is
starting at 75 and the changes start from yesterday even though there are
known changes earlier than this date.

This is the second spreadsheet that this has happened to within the last two
weeks. How do I show/find the other changes. I am using Excel2003 with SP3.