Collection Tree : displaying only parent collections

Normally, only parent collections appear by default on the public /collections browse pages with Collection Tree plugin.
But even child collections appear in my v2.2.2 installation :
(for instance, Série 11, no 1130 is a child collection).

I suppose it is because I have entered collections directly in the SQL database.
Can someone tell me where I have to intervene in order to modify this behaviour ?



For the same issue some times ago, I patched the plugin:

Via sql, simply fill the "collection_trees" table with parent collection id.

Daniel Berthereau
Infodoc & knowledge management