DxO has simply flattened the hierarchical keyword path and put the individual components into the flat keywords field. PM handles that just fine.
Yes, Kirk, we agree, I'd say PM is handling it too well.
The problem is, precisely, to have the keywords in duplicate, hierarchical and flat.
This unnecessarily clutters up the keywords and, consequently, also clutters up the list of keywords in the "Filter" tab of the catalog, which can quickly become very very long !!!
Hence the proposal of an option to ignore this field, for users who do not wish to see in PM flat keywords generated by third-party applications.
(If this is possible?)