Both searches use exactly the same settings within the client, except the left searches for "e" and the right searches for "es".
Searches are sorted by date updated. The mod, Essential Commands does not just show up low on the list (as if the file update had not been synced). It does not appear at all in the results of the first search.
(Mod was updated about an hour before the time of testing, and the client showed as much. Despite this, it did not appear in the "Last Updated" section until it was searched for explicitly.)