G’day Jo,
You may have another map plugin that is also loading the Google Maps API scripts, or your theme is doing that. It’s doing it with an invalid version number too (4.2.2, the WordPress version, not the Google Maps API version) and loading it over https, whereas Flexible Map is loading v3.19 over http when the page’s protocol is http. You can see this from the error message Google Maps is logging to the browser’s console:
You have included the Google Maps API multiple times on this page. This may cause unexpected errors.
Either disable one of the plugins, or tell me which the other plugin is so that I can find a solution for you. If it’s your theme, perhaps you can ask the theme developer for assistance.
cheers,
Ross