The map doesn’t work with parent-child categories

Hey there,
I just love this Plugin ’cause it just does what I need.
But which doesn’t work is to set up the locationposts in a hierarchical category structure (as an example: Locations -> Germany -> Lower-Saxony) what I really have to do, because the Map only shows the selected category, so when my post is just in the category Lower-Saxony and I’ve set the map to show the category “locations” it doesn’t show anything.

I hope you could fix this, because I can’t select the parentcategory “locations” for all of the locations (just the childcategories).

With best wishes,
Henning Büttner ??

The page I need help with: [log in to see the link]