Data is not updated in Workspace

Hi guys

I have a problem when i am working into PBI workspace.

Every month we update data into a report, and last update was made on 23.03(1 week ago). But when i check the report for this month(March) i cannot see any data.

If i check the previous months, everything is fine. 

What can be the problem. 

I want to mention that i am a begginer in PBI Workspace.

Thanks