Total results of Reach in a table with Meta Connectors

Hi everyone!

We have a doubt with looker studio. We have a table with many KPIs, and one of them is Reach. The connector is with Meta through Supermetricks. The issue is that when we select "all campaigns" it gave a total number of Reach, but if we choose only one campaign that number rises, is bigger than we select all campaigns. Someone has that problem? Can someone help us, please!