Is this the third page of a single group or is your report showing one group per page? If page 3 is not the same group value as page 2, odds are that the field in question does not have a value for the group on page 3. To test this you can do something like this:
1. Create a new formula that will do something like the following:
If IsNull({field that is blank}) then "Null Field"
else if ltrim(rtrim({field that is blank})) = "" then "Field is blank"
else {field that is blank}
Put this on the report instead of the actual field. This will show you whether there is data in the field or not. (NOTE: NULL is NOT the same as a blank string! That's why you have to test for the separate conditions.)
-Dell