I've used a label named Sanity
then, I've used two other labels named : Automated, Manual. each issue that has the automated or the manual label has also the sanity label

The filter I used has 49 issues in total:
35 issues have two labels: Automated, Sanity
14 issues have two labels: Automated, Manual

->The total issues counts 98 (35*2+14*2)

The pie chart plugin counts the total issues correctly

I'm us