I resolved the duplicate entry. 

The supermarket you didn't see was added to OSM just 10 days befor your edit, so that was a bad coincidente and not your fault.
In general, however, it is good to use an up to date version of Organic Maps and to update the maps to the latest version to avoid double entries. Your version is reportedly from 2024.06.19, that's rather old, the latest version is from 2024.08.17.

Best regards
map per