LoginSecure Google Maps + Directions: Help! The map is showing Developer Mode?
Since the 11th of June 2018 google introduced its new pay-as-you-go system for Google Maps. If you use an old API key then you probably haven't set up your Google Account to allow for this new system. In such cases, Google will automatically put all maps connected to this API key into developer mode.
KB Article: https://loginsecure.eu/helpdesk/knowledgebase/view-article/104-loginsecure-google-maps-directions-help-the-map-is-showing-developer-mode