I see many locations on your site, all in France. If some are not geocoding correctly it could be the address or Google map domain cannot find them.
Are you getting any error message that shows inactive geocode, or some other error messages?
Are you seeing all the locations under your location manager but they are just not appearing as markers?
Are your other plugins using the current jquery versions? Without a screenshot I cannot tell what version of WP you are using, but they now require Themes and plugins to use 1.11 or higher, they are using jquery 1.12.
Articles about versions and WP 4.5