In Microsoft Office SharePoint Server 2007 or in Microsoft Windows SharePoint Services 3.0, you notice that the survey count in the Summary view differs from the survey count in the All Survey Result view. Specifically, the Number of Responses value differs from the Show all responses value, and AllItems.aspx shows less surveys than Overview.aspx and Summary.aspx.
This issue occurs because SharePoint does not show incomplete surveys on the Show all responses view.
This behavior is by design. To avoid this problem, make sure that users click the Finish button in the survey.