Map(s) not showing in checkout

While the debugging information shows a success for finding ParcelShops the locator isn't shown.
As a test I added the leaflet demo block and funny enough the parcelshops where displayed on the first two test maps.

http://i1383.photobucket.com/albums/ah313/mvgucht/nomap_zpskq7htvlg.png
http://i1383.photobucket.com/albums/ah313/mvgucht/leafletdemo_zpsqwddqkf...