Usually this problem has to do with the filters set on the report.  Make sure that the report is filtering on All Donations and that the Date Range is for All Time.

If the report still does not list the Donations, make sure that the Campaign being filtered on is spelled correctly and does not have any hidden spaces.

If there is an extra space in the name of the Campaign, it will not appear on the Campaign Record because the white space in record names is condensed.