Individual portlets do not show the filters changed at global level in the dashboard layout. Why?

Individual portlets do not show the filters changed at global level in the dashboard layout. Why?

When you change the filter at global level for the entire dashboard, by clicking on the icon on the top right corner of the homepage, the individual portlets do consider the changed filter and displays the data accordingly. But the changed filter will not reflect across the individual portlets. The individual portlets will have the filter configuration of their own. This is the present functionality of ARC.