Hi,
I am the developer of Leaflet Maps Marker and a user reported a incompatibilty with your plugin (see http://wordpress.org/support/topic/mapsmarker-dailystats?replies=1#post-3929208)
The main problem is that your plugin is inserting the css and js file on all admin pages and thus breaking my settings page.
Please take a look at https://github.com/robertharm/Leaflet-Maps-Marker/blob/dev/leaflet-maps-marker.php line 334-362 how I changed my code to include my js+css only on my plugin“s pages.
It would be great if you could solve this - in the meantime I will add a warning, that your plugin is not compatible...
Thanks,
Robert