drilldown cartogram

Hi,

I'm using Drilldown Cartogram viz for showing France administrative landscape (Régions -> Départements -> Villes).

FYI : Régions = Region, Départements = County, Ville = City

When I'm drilling from Régions to Départements or from Département to Ville my other visuals are filtering well based on my selection.

Working really well except one thing.

But when i'm clicking on a specific Ville the filtering doesn't work anymore.

Any idea ?

Thx for any help,

Regards