Trouble with googleMaps (PlugIn Event-manager)

Hi there,

I install the plugIn "Events.Manager" (http://wordpress.org/extend/plugins/events-manager/)

It has an integration of googleMaps (...Events Manager can find the location of your events, and accordingly display a map.).

When you add a new event inside Wordpress Backend, there is a preview of the locations map.
This works really fine.
(see Attach "preview.png")

But on the Atahualpa Theme Web-Site the view of the Map is broken with squares and no pointer-balloon)
(see Attach "map_on_site.png)

By choosing another theme the google map view on the Web-Site is o.k.

So there might be a conflict with the scripts (maybe .css) of the plugIn and Atahulpa?

Is there something I can do?

greetings,
curious