If you find yourself running a report and not getting the results you expect, I would try to "revert" the report to it's original version. To revert, run the report and then click modify report. At the lower left of the modify button is a revert button. Press this button and it will run the report as original configured. Then you can modify from there. Sometimes POS will not clear all of the filters even if you remove them and this is a quick way to make sure.