PowerBI Premium Report Refresh

Hi,

  In PowerBI Premium - Cloud based web portal, shows (at workspace -> Datasets -> Report then under "Refreshed") Today's Date Time. This infer that report is refreshed as per schedule...But when we open .pbix file for that report and open the EDIT QUERIES section ...For a particular imported table, It shows the preview may be 49 days old. This is is the reason the report is actually not being refreshed, which is an issue.

Why?

How to resolve this?

P.S. This is happening for few reports only.

Pranav.