WordPress 5.0.3 if marker added

Hey.
I use your plugin in the newest WP version.
And when i check the wp-admin/admin.php?page=leaflet-shortcode-helper site
all maps with a marker one it (with only one) are shown only maker and they have all grey backgrounds. So also the samme effect i got on my page when i add

1. [leaflet-map lat=48.19850011777868 lng=14.109430611133575 zoom=10]
Show map normal
2. [leaflet-marker lat=48.1985 lng=14.10943]
no it show me a grey map and i need to zoom out after that the map where shown.

If you wand i can send you Screenshots.