Hi Claudia- I'm not sure if I understood your question correctly, in the grand totals, Tableau is Averaging the averages so you see the number. Are you looking for something like this?
Re-arrange pills in rows, from analytics pane - add totals and grand totals. Change totals using "SUM" from "Analysis" tab.
Let me know if I got it wrong, elaborate a little please.
Soham, thanks for your Support
HAve a nice and blessed day