Period Name parameter

Summary:

Hi ,

I am currently working on report which is filters using period_name.

when i select single month(period_name), the data looks promising. when multiple period_name (Ex. Jan-21 to May-21)are selected, the report pulls data outside the filtered condition.

The issue is due to period_name parameter, Can anyone help me on how to use period_name parameter in between multiple period_name

Thanks in advance