The Repair Geometry tool does not identify (or fix) all geometry errors which are identified by the Check Geometry tool.
Last Published: December 15, 2016ArcGIS for Desktop
Bug ID Number
September 18, 2015
November 24, 2020
ArcGIS for Desktop
After review by the development team, it has been determined that this issue is related to a known limitation with the software that lies outside of Esri's control. The issue's Additional Information section may contain further explanation.
Self-intersections maybe re-introduced on storing the shape back into the feature class. The Integrate tool fixes this issue.
Use the Check Geometry tool to isolate geometry errors, then manually fix any ones that are not fixed by the Repair Geometry tool.