Variant between Total Distinct Count of visual Table & Stacked Bar Chart

Dear BI Community Team,

I have a sales order data and create a mesuare to count the number of store purchased. When I build the visual of table by suppliers, by sales rep. I am getting the same number. 

Measure: 

But if I build it as Stacked bar chart, and compare with table by sales rep or supplier. It's different.

Any suggestion/advise of this issue?

Thanks and Regards,