Calxa runs by background identifiers, not what is displayed on the screen. The KPI may have been deleted and a new one created, however, using the same name will not include it in existing report selections.
De-select the KPI in the Report > Builder screen,
Refresh the screen using Ctrl + F5
Select the new KPI
Refresh the report to check it now runs correctly.
Note:
If you are using inline KPIs in an Account Tree, you will need to remove the old KPI and add the new one in the Account Tree.