I made a report to show organization's date of first gift given and date of  last gift given. When I run the report although it appreas that all the organizations pull I noticed that some of the date of last gift given is incorrect. 

An example is for Affordable Housing Access the last date says 9/21/2015 but when you open their profile the last recorded gifts is 9/25/16. Many of the orgs are doing this, how can we fix it? 

The report is saved as: Organization Giving First & Last Gift

Thanks,