markers don’t show up anymore when published

Hi team,
your plugin worked fine for a couple of weeks but now no markers don’t show up anymore. Also i cannot change the theme. All is perfect in the edit screen ore map builder but when published on my website the map doesn’t change. Installed the required API’s already, different browsers and tried a couple of new maps, all the same.
It can be checked here http://bvdks.de/kettlebell-training-deutschland/
When zooming in there are also no city or street names.
Any idea would be helpful.
Thx in advance