A fix has been rolled out by Atlassian for the indexing/reporting problems.

Atlassian have created a public issue to track the fix for the indexing issue that you can track here: https://ecosystem.atlassian.net/browse/CE-1053

Atlassian have identified an issue with indexing on a subset of Confluence cloud sites that is affecting the reporting component of Comala Approvals. Add-on information does not appear to be getting indexed correctly so no data will displayed in the space reports.

We will provide more information here when Atlassian provides an update.