Overall Project Duration Based on Individual Project Default Calendar

Hi All,

I have recently imported few p6 files . The issue is that for some project's overall duration is not changing based on the calendar setting, coming under the default  tab of the Project. But the overall duration is only changing based on the selection of calendar under Enterprises......Calendar.....any Default calendar.

For few other projects, overall duration is changing perfectly according to calendar setting under the Default tab. Overall duration will not be affected, even if I select any calendar under Enterprises......Calendar.....any Default calendar.

Why this descrepancy, and I need to change the overall duration as per the calendar setting under the default tab of the Project.

Am i missing any setting.

Best Regards

Kannan