Events+ is creating unnecessary duplicate maps

Events+ is creating duplicate maps every time I view an event with maps - see attached file.
I am viewing single events using the default single-incsub_event.
Each time I view the single event, a new duplicate map is created in the _agm_maps table.
How can I stop this happening?

Note: there are settings in Google Maps admin, which will create new maps automatically:
a) Use Custom Post meta support - this is permanently on.
b) To assign maps to a post - this is permanently set to Yes.
I suspect these settings are causing the duplicate maps.