No records were returned, when the 'Feature on Feature Checks', 'Geometry on Geometry Checks' test ran on full database. However, when zoomed in to a smaller area and chosen extent, the test returned expected records.
ArcMap and Data Reviewer 10.8.1.
Can you please confirm the following related to your workflow:
1. What type of data you are using: File Geodatabase or SDE ?
2. Are you running an individual check or batch job with feature on feature ?